Ptt Global Chemical Public Company Limited

Myriant Corporation

Group Novasep Sas

Ramnik Singh

Rajesh Dasari

Yuriy Roman-Leshkov

Cenan Ozmeral

Montgomery Alger

Yu Noda

Robert M Rioux

Vijay Gnanadesikan

Steven J Gerberding

Described herein are solid acid catalysts and the methods for catalytically preparing &#x3b1;,&#x3b2;-unsaturated carboxylic acids and/or esters thereof. In one aspect, a zeolite catalyst may be used. The catalyst may, in certain embodiments, be modified to improve the selectivity and/or conversion of a reaction. For instance, a catalyst may be modified by ion exchange to achieve a desirable acidity profile in order to achieve high level of conversion of reactants and selectivity for desirable products of the catalytic reaction. In another aspect, a variety of feed stocks (e.g., starting compositions) may be used including an &#x3b1;-hydroxycarboxylic acid, an &#x3b1;-hydroxycarboxylic acid ester, a &#x3b2;-hydroxycarboxylic acid, a &#x3b2;-hydroxycarboxylic acid ester, cyclic esters thereof (e.g., lactide), and combinations thereof.

Method to produce acrylic acid with acetaldehyde as the main by-product

The present invention is in the field of producing bio-based commodity organic chemicals such as bio-acrylic acid, bio-acrylonitrile, and bio-1,4-butanediol using renewable carbon sources as feedstock. In the first stage of the present invention, bio-1,3-propanediol is derived from renewable carbon sources through microbial fermentation. In the second stage of the present invention, bio-1,3-propanediol is converted into bio-acrylic acid or bio-acrylonitrile or bio-1,4-butanediol.

Process for manufacturing acrylic acid, acrylonitrile and 1,4-butanediol from 1,3-propanediol

This present invention relates to the processes for the purification of succinic acid from a fermentation broth containing ammonium succinate. The process for the purification of succinic acid described in this invention involves the use of ion exchange resins for splitting the ammonium succinate in the fermentation broth. During the passage of the fermentation broth through a cationic ion exchange resin, the ammonium succinate is split into ammonium cation and the succinate anion. The proton on the resin surface is exchanged for the ammonium ions and the succinate anion is reduced to succinic acid with the protons released from the ion exchange resin. The bound ammonium is released from the resin with the addition of a strong acid such as sulfuric acid and thereby the ion exchange resin is regenerated for subsequent use. The ammonium sulfate by-product resulting from the regeneration step of this process can be used as a source of fertilizer. This process for the separation of succinic acid from the fermentation broth containing ammonium succinate can also be carried out with an anionic ion exchange resin wherein the succinate anion is retained on the surface of the ion exchange resin and subsequently released from the ion exchange resin during the regeneration step.

Purification of succinic acid from the fermentation broth containing ammonium succinate

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Winchester, MA, United States of America

Ramnik Singh