|
Match
|
Document |
Document Title |
|
|
7304182 |
Crystalline parahydroxybenzoic acid anhydride and process for preparing the same
The present invention provides a process for preparing crystalline parahydroxybenzoic acid anhydride, comprising the step of precipitating and isolating parahydroxybenzoic acid in an aqueous...
|
|
|
7220881 |
Process for production of acid anhydride
According to the present invention there is provided a process for producing an acid anhydride by reacting a carboxylic acid, preferably a carboxylic acid having a polymerizable group, with a...
|
|
|
7049467 |
Process for the manufacture of isobutyric anhydride
This process for the manufacture of isobutyric anhydride by reacting acetic anhydride with isobutyric acid, distilling the acetic acid generated as it is formed, is characterized in that the...
|
|
|
6646062 |
Production of improved polymers via the use of star cores
There is provided a process for producing high molecular weight polymer comprising the step of reacting one or more preformed linear polymers with one or more cores (as hereinbefore defined) to...
|
|
|
5824820 |
Process for the preparation of citraconic anhydride
The present invention relates to a novel process for the preparation of citraconic anhydride. More precisely, the invention relates to a process for the preparation of citraconic anhydride from a...
|
|
|
5705683 |
Carbonylation of olefins
The process for carbonylating olefins with carbon monoxide in the presence of water, an alcohol or a carboxylic acid and a halogen-free catalyst comprises using a catalyst comprising nickel or a...
|
|
|
5606068 |
Acid anhydrides, their preparation and their use
This invention relates to novel anhydrides of general formula (I), ##STR1## wherein Ar is an aryl radical, and either R 1 is C 6 H 5 --CO or (CH 3 ) 3 C--O--CO, R 2 is a hydrogen atom and R 3 ...
|
|
|
5516735 |
Method for stabilizing rhodium compound
A concentrated catalyst solution provided in the carbonylation reaction in which methyl acetate or dimethyl ether is chemically bonded with carbon monoxide in the presence of a catalyst system...
|
|
|
4874558 |
Polymer catalyzed synthesis of acid anhydrides
Solid-phase copolymers of 4-vinylpyridine or 4-vinylpyridine 1-oxide may be employed as catalysts in the formation of acid anhydrides. A water soluble polymer of 4-vinylpyridine 1-oxide may also be...
|
|
|
4830789 |
Process for producing carboxylic acid anhydrides
The present invention provides (1) a process for producing a colorless aromatic acid anhydride having a high purity in a high yield by reacting an aromatic carboxylic acid having a carboxyl group...
|
|
|
4595541 |
Process for the preparation of trifluoroacetic anhydride
The present invention relates to a process for the preparation of trifluoroacetic anhydride which comprises bringing together trifluoroacetic acid with the anhydride of an α-halogenated acid.
|
|
|
4477382 |
Preparation of carboxylic acid anhydrides
The conversion of a carboxylic acid having the formula RCOOH wherein R is a hydrocarbon group having from 1 to 20 carbon atoms to its corresponding anhydride by contacting said carboxylic acid with...
|
|
|
3530178 |
(4 - (2 - ALKYLIDENEACYL)PHENOXY) ALKANOIC ACID ANHYDRIDES AND THEIR PREPARATION
|
|
|
3513180 |
PREPARATION OF CARBOXYLIC ANHYDRIDES
|
|
|
3038894 |
Method of making cellulose acetate
|
|
|
3030277 |
Method of making acetic anhydride from lignified cellulose
|
|
|
2957026 |
Preparation of mucochloric anhydride
|
|
|
2872481 |
Process for preparing low molecular carboxylic acid anhydrides
|