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7445702 |
Desulphurisation
Propane and/or butanes are separated from a hydrocarbon feedstock contaminated with alkyl mercaptans by fractional distillation at such a pressure that the separated overheads stream containing...
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7431804 |
Method for carrying out the distillation or reactive distillation of a mixture containing at least one toxic constituent
A process is proposed for the distillation or reactive distillation of a mixture that includes at least one toxic component, the process being carried out in a column containing a structured...
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7425247 |
Method for producing an aqueous solution hydroxylamine
This invention relates to a method for producing an aqueous solution of free hydroxylamine (HA) by simultaneous countercurrent treatment of a HA salt with ammonia or ammonia water, then separating...
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7182840 |
Method and device for exploiting heat resulting from the production of 1,2-dichloroethane
The invention relates to a method and a device for the optimal use of reaction heat resulting from the production of 1,2-dichloroethane from ethene and chlorine. The aim of the invention is...
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7179388 |
Method for removing formic acid from aqueous solutions
Formic acid is at least partly removed from an aqueous solution comprising formic acid, cyclohexanone and cyclohexanol by decomposition over certain decomposition catalysts. The method is...
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6946068 |
Process for desulfurization of cracked naphtha
A process for concurrently fractionating and hydrotreating of a full range naphtha stream. The full boiling range naphtha stream, for example which is derived from fluid catalytic cracking, is...
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6767517 |
Method and apparatus for the continuous production of diaryl carbonates
An energy efficient series of mass and energy integrated reactive distillation columns and distillation columns are used to effect the production of diaryl carbonate. Utilizing the method or...
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6583325 |
Process for the production of tertiary alkyl ethers
A process for the production of tertiary ethers from the reaction of isoolefins with lower alcohols, such as methanol, uses two distillation column reactors in series to maximize conversion,...
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6583326 |
Process for separating phenol from a mixture comprising at least hydroxyacetone, cumene, water and phenol
Phenol is separated from a mixture containing hydroxyacetone, cumene, water and phenol, by fractionating the mixture in a process with a fractional distillation step and a phase separation step to...
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6416659 |
Process for the production of an ultra low sulfur
A process for the hydrodesulfurization of a diesel boiling range petroleum fraction wherein the hydrodesulfurization is carried out concurrently with a fractional distillation in a distillation...
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6338793 |
Process for the desulfurization of a diesel fraction
A process for the hydrodesulfurization of a diesel boiling range petroleum fraction wherein the hydrodesulfurization is carried out concurrently with a fractional distillation in a distillation...
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6299734 |
Preparation of an aqueous solution of free hydroxylamine
An aqueous solution of free hydroxylamine is prepared by treating a hydroxylammonium salt with ammonia by the countercurrent method in a stripping column by a process in which hydroxylamine is...
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6137023 |
Process for the production of high purity isobutene combining reactive distillation with hydroisomerisation and skeletal isomerisation
The invention relates to a process for producing high purity isobutene from a hydrocarbon cut essentially comprising olefinic hydrocarbons containing 4 carbon atoms per molecule including...
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6037489 |
Method of purifying glyoxylic esters and distillation equipment for purifying glyoxylic esters
A method for purifying glyoxylates includes (1) a coarse distillation process in which a crude glyoxylate in which water coexists is, in a film form, continuously subjected to coarse distillation,...
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5948948 |
Paraffin isomerisation process using reactive distillation
The invention concerns a process for isomerising a feed containing essentially hydrocarbons, preferably paraffins preferably containing 5 and/or 6 carbon atoms per molecule, in which said feed is...
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5847249 |
Apparatus and process for catalytic distillations
A process for selectively treating the components in a multi-component stream in a distillation column reactor. Additional catalytic distillation structures are placed as a secondary bed in the...
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5817906 |
Process for producing light olefins using reaction with distillation as an intermediate step
The present invention relates to a process for the production of light olefins comprising olefins having from 2 to 4 carbon atoms per molecule from a crude oxygenate feedstock. The crude oxygenate...
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5779883 |
Hydrodesulfurization process utilizing a distillation column realtor
A process for the hydrodesulfurization of petroleum streams is disclosed wherein the sulfur containing petroleum stream is contacted along with hydrogen at a partial pressure of less than 70 psig...
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5763714 |
Process and apparatus for the production and recovery of p-xylene
A mixed aromatic stream is hydrotreated to remove olefins and fractionated to separate C 9 + heavies in a distillation column reactor and the C 8 and lighter material is fed to a selective...
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5660691 |
Process for the production of tocotrienol/tocopherol blend concentrates
Disclosed is an improved process for the preparation of tocotrienol/tocopherol blend concentrates from vegetable oil distillates which are enriched in tocotrienols. Tocotrienol/tocopherol blend...
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5512691 |
Process for the production of tocopherol concentrates
Disclosed is an improved process for the preparation of tocopherol concentrates from vegetable oil distillates. Tocopherol concentrates are obtained containing 20-80% tocopherol by weight, with an...
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5507919 |
Apparatus for the thermal and catalytic defluorination of alkylate
An apparatus and method are provided for the defluorination of a liquid hydrocarbon mixture, containing organic fluorides, produced during the conversion of hydrocarbons using a fluorine-containing...
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5502249 |
Process for the removal of iodine from acetyl compounds
Disclosed is a process for the removal of iodine, including I 2 , I - and iodine-containing organic compounds, from acetic acid or anhydride wherein an acetyl product stream comprising (i) acetic...
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5336841 |
Oxygenate removal in MTBE process
A process is provided to remove oxygenates from a C 4 raffinate stream from an MTBE plant. A back-cracking catalyst is placed into the bottom of an oxygenate removal column which will convert any...
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5294305 |
Ethylene glycol recovery process
The present invention is an improved process for the recovery of ethylene glycol from spent glycol generated in the manufacture of polyethylene terephthalate. The spent glycol typically consists of...
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5284969 |
Process for the production of polyisocyanates
A process for the continuous catalyst-free production of polyisocyanates by thermal decomposition of the N-substituted carbamic acid esters corresponding to the polyisocyanates, in which the...
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5246722 |
Preparation of concentrates of coloring agents
Concentrates of natural coloring agents such as carotene are prepared from organic media, particularly from palm oil, by a process in which the oil, together with a volatile solvent, is subjected...
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5183538 |
Extraction plus ion exchange processing of a brine stream
A method for recovering a liquid diluent having a low salt content from an organic/aqueous mixture which contains significant quantities of the diluent, an alkali metal salt, and water comprises an...
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5122235 |
Process for the removal of chloroprene from, 1,2-dichloroethane
Disclosed herein is a process for removing chloroprene by subjecting chloroprene-containing 1,2-dichloroethane to heat treatment at a temperature in the range of from the boiling point (85° C.) of...
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5108551 |
Reclamation of alkanolamine solutions
The present invention provides a method for purifying alkanolamine solutions which have lost at least a portion of their acid gas sorption capacity due to degradation of the alkanolamine into heat...
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4944847 |
Method for inhibiting epichlorohydrin fouling
A method of inhibiting fouling in distillation towers, overhead lines, reflux lines, and condensers operating in a process to manufacture and purify epichlorohydrin. This method resides in treating...
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4867849 |
Purification of alkyl glyoxylate
There is disclosed an improved process for the manufacture of glyoxylic acid obtained by oxidation of glycolic acid. For processing purposes alkyl esters of these acids are employed. Increased...
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4778882 |
Method of carrying out chemical dehydration reaction and an apparatus therefor
An apparatus and a method for carrying out the dehydration reaction to produce a high boiling compound comprises charging a raw material and an organic solvent into a circulating system including a...
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4765869 |
Process for the production of a dialkyl maleate
A continuous process is described for the production of a substantially acid free dialkyl maleate, for example diethyl maleate, from a feed stream containing a major amount of dialkyl maleate and a...
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4727161 |
Process for the preparation of indoles
A process for producing an indole which comprises reacting an aniline and a diol in the presence of a catalyst to produce a reaction mixture containing the indole, unreacted aniline and...
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4522688 |
Process for recovery of cyclopentadienes
The process gives highly pure cyclopentadiene and methylcyclopentadiene from a cracked gasoline fraction. The merit of the process is that cyclopentadiene and methylcyclopentadiene are recovered by...
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4519875 |
Purification of ethylene glycol derived from ethylene carbonate
Ethylene glycol is purified, particularly for fiber-grade applications, by removal of the residual ethylene carbonate from which the glycol was derived. The effluent from a reactor in which...
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4482775 |
Isomerization of C.sub.4 alkenes
A method for isomerizing isobutene or n-butene to produce a mixture of isobutene and normal butene, and polymerizing at least a portion thereof to produce isobutene/n-butene codimer, which...
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4454358 |
Continuous production of ethanol and plural stage distillation of the same
Ethanol is produced continuously via the carbonylation of methanol, by (a) carbonylating methanol, in a reactor R, in the presence of a carbonyl complex of a metal of group VIII of the periodic...
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4420376 |
Separation of resorcinol from non-extractable impurities
An improved process for recovering high purity resorcinol produced by the rearrangement of m-diisopropylbenzene dihydroperoxide in which the rearranged product mixture is neutralized, the...
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4391677 |
Process for producing substantially sulphur-free butene-1
A process is disclosed for producing a substantially sulphur-free, butene-1 rich stream from a butene-containing C 4 hydrocarbon feed stream by passage through a desulphurization zone, e.g....
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4360695 |
Continuous preparation of adiptic acid
In a process for the continuous preparation of adipic acid by hydrolysis of C 1 -C 4 -alkyl adipates with water at an elevated temperature in the presence of a strongly acidic ion exchanger, the...
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4317926 |
Process for preparing and recovering acrylic acid
In a process for producing acrylic acid which comprises contacting with water an acrylic acid-containing reaction product gas which has been obtained by the catalytic vapor phase oxidation of an...
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4312714 |
Decreasing 3-bromo-2-butanone content of acetic acid
The oxidation of liquid n-butane with oxygen gas at a temperature of from 120° C. up to 235° C. in the presence of an acetic acid solution containing bromide ion in combination with ions of...
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4282389 |
Process for the simultaneous manufacture of pure MTBE and a substantially isobutene-free mixture of C.sub.4 -hydrocarbons
A process for the simultaneous manufacture of pure methyl tertiary butyl ether (MTBE) and a substantially isotubene-free mixture of C 4 -hydrocarbons, by reacting the isobutene contained in the...
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4278503 |
Low bromine content glacial acetic acid
Excessive energy consumption of a combination of multi-fractionations and multi-distillations of concentrating aqueous acetic acid product of liquid phase oxidations, especially oxidation of liquid...
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4273622 |
Method of treating alpha-methylbenzylalcohol dehydration products
Residual products obtained in the catalytic dehydration of alpha-methylbenzyl alcohol are treated to recover monomeric styrene values by a process which comprises fractionally distilling the...
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4268362 |
Method for purifying acetic acid
A method for purifying raw acetic acid containing formaldehyde is provided wherein raw acetic acid is heat-treated at a temperature of about its boiling point or higher, in advance of the...
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4262140 |
Production of anhydrous or substantially anhydrous formic acid
A process for the production of anhydrous or substantially anhydrous formic acid by hydrolysis of methyl formate which is carried out in a column having an upper fractionating section, a middle...
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4254246 |
Column system process for polyester plants
A new process for use with continuously operated plants for the production of polyester polymers suitable for producing fibers, bottles and film, by reacting ethylene glycol and terephthalic acid...
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