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Process for continuous catalytic acetylation

A technology of acetylation and reactor, which is applied in the field of continuous acetylation of polysaccharides, can solve the problems of large cooling surface and difficult realization of reactor, and achieve the effect of energy balance

Inactive Publication Date: 2011-07-13
AVL LIST GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The cooling surface required per unit volume of the reactor is very large, so it is difficult to achieve such a large reactor

Method used

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  • Process for continuous catalytic acetylation
  • Process for continuous catalytic acetylation

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Embodiment Construction

[0020] The reactants or part of the reactants, especially polysaccharides and additives, are continuously fed into the premixer 1 and mixed homogeneously there. Use a centrifuge or other mechanical means to separate excess acetic acid. It is also possible to pump the suspension obtained from the premixer 1 directly into the reactor 3 or to pass it into the reactor 3 through a vacuum valve.

[0021] In the case of separate injection, the other part of the separately injected reactants is directly and continuously fed into the reactor 3 . It can be a catalyst, acetic anhydride or other additives.

[0022] As a result of the exothermic reaction, the acetic acid and part of the acetic anhydride evaporate, they are condensed in the condenser 4 and part 5 or all of them are sent back to the reactor or are extracted 6 . In order to control the product temperature (evaporation temperature) in the reactor, it is possible to connect the offgas stream to a vacuum device.

[0023] It i...

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Abstract

In a process for continuous acetylation of polysaccharide, a pressure is to be established in a reactor chamber such that a boiling point of a reaction mixture corresponds to a desired reaction temperature and an exothermicity of the reaction is controlled by evaporative cooling.

Description

technical field [0001] The present invention relates to a method for the continuous acetylation of polysaccharides. Background technique [0002] The process of acetylation of polysaccharides has been known for a long time. Traditionally, the polysaccharide to be reacted is put into a stirred vessel with acetic anhydride, anhydrous acetic acid and other additives. [0003] In this way, acetic anhydride reacts with polysaccharides to produce polysaccharides acetic acid and acetic acid. Acetic acid quickly becomes a reaction product and a solvent for the reaction product. Polysaccharides are usually fully acetylated, but partial acetylation is also possible according to the invention. For a stable and rapid acetylation reaction, the polysaccharide is injected with the aid of a catalyst. Typically the catalyst is generally a strong acid. The additives added usually act as plasticizing polysaccharides, and most of them are also converted together, and the product is a plast...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/00C08B3/06C08B17/02C08B31/04
CPCC08B17/02C08B3/06C08B31/04
Inventor 丹尼尔·淮特安迪瑞斯·迪内尔
Owner AVL LIST GMBH
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