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A stirring grinding reactor and its method for preparing isocyanate

A reactor and stirring shaft technology, which is applied in the field of preparing isocyanate reactors based on high-temperature salt-forming phosgenation reaction, can solve the problems of long photochemical process time, low salt-forming concentration, and many side reactions, so as to reduce the encapsulation and improve the Mass transfer rate, the effect of reducing energy consumption

Active Publication Date: 2017-07-21
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a kind of stirring grinding reactor, another purpose of the present invention is to provide a kind of method for preparing isocyanate monomer by high-temperature salt-forming phosgenation method, can solve the common formation in the existing salt-forming phosgenation reaction Low salt concentration, hydrochloride agglomeration and diamine encapsulation caused by agglomeration make it difficult for internal materials to participate in the photochemical reaction in the next stage, resulting in a long photochemical process and the generation of urea impurities, resulting in many side reactions and excessive yield Low technical problems, especially the ability to process diamines with high melting points for high-temperature salification, so that the hydrochloride can undergo phosgenation reaction at a high concentration to obtain qualified isocyanate

Method used

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  • A stirring grinding reactor and its method for preparing isocyanate
  • A stirring grinding reactor and its method for preparing isocyanate
  • A stirring grinding reactor and its method for preparing isocyanate

Examples

Experimental program
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Effect test

Embodiment 1

[0062] use attached figure 1 In the process shown, the volume of the salt-forming reactor is 500L, and there are 12 groups of dynamic and static rotating discs in total, 7 groups at the upper part of the feeding port, and 5 groups at the lower part of the feeding port. The lowermost end of each static rotating disc is located below the static rotating disc And the axial distance of the uppermost end of the moving rotating piece of the bell is the same as 50mm, the feed inlet is located above the distributor in the middle of the reactor, the axial distance between the lowermost end of the feed inlet and the uppermost end of the distributor is 150mm, and the lower part of the distributor It is a moving rotating piece, the axial distance between the lowermost end of the distributor and the uppermost end of the moving rotating piece is 80 mm, and the outlet is located at the bottom of the reactor. The moving rotating piece is a solid circular cake-shaped structure with an angle b...

Embodiment 2

[0067] use attached figure 1In the process shown, the volume of the salt-forming reactor is 500L, and there are 7 sets of dynamic and static rotating plates in it, 4 sets at the upper part of the feed inlet, and 3 sets at the lower part of the feeding port. The lowermost end of each static rotating plate is located below the static rotating plate And the axial distance between the uppermost ends of the adjacent movable rotating plates is the same as 200mm, the feed inlet is located above the distributor in the middle of the reactor, the axial distance between the lowermost end of the feed inlet and the uppermost end of the distributor is 80mm, and the lower part of the distributor It is a movable rotating piece, the axial distance between the lowermost end of the distributor and the uppermost end of the moving rotating piece is 50 mm, and the outlet is located at the bottom of the reactor. The moving rotating piece is a solid circular cake-shaped structure with an angle betwe...

Embodiment 3

[0070] use attached figure 1 In the process shown, the volume of the salt-forming reactor is 500L, and there are 10 groups of dynamic and static rotating discs inside, 6 groups at the upper part of the feeding port, and 4 groups at the lower part of the feeding port. The lowermost end of each static rotating disc is located below the static rotating disc And the axial distance between the uppermost ends of the adjacent movable rotating plates is the same as 100mm, the feed inlet is located above the distributor in the middle of the reactor, the axial distance between the lowermost end of the feed inlet and the uppermost end of the distributor is 150mm, and the lower part of the distributor It is a movable rotating piece, the axial distance between the lowermost end of the distributor and the uppermost end of the moving rotating piece is 50 mm, and the outlet is located at the bottom of the reactor. The moving rotating piece is a solid circular cake-shaped structure with an an...

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Abstract

The invention discloses a stirring grinding reactor and a method thereof for preparation of isocyanate. The reactor is provided with dynamic rotation slices and static rotation slices in a mutual spacing manner; the dynamic rotating slices and the static rotation slices are provided with channel holes, the dynamic rotation slices each have a saucer-shaped structure having a serrated surface, and the static rotation slices have the structure complementary with that of the dynamic rotation slices. A special stirring structure of the reaction kettle can avoid hydrochloride caking, and increases the salifying concentration and the diamine conversion rate. A gas-liquid reaction effect is strengthened, the temperature control of the system is stable, obtained hydrochloride granules are exquisite, the reaction time can be shortened during a liquid phase phosgenation reaction, the product yield is improved, at the same time, blocking of salifying equipment can be reduced, the equipment can be allowed to perform long-term stable running, the equipment structure is concise, and large-scale industrialized application is convenient.

Description

technical field [0001] The invention relates to a stirring and grinding reactor and a method for preparing isocyanate by using the reactor, in particular to a reactor and a method for preparing isocyanate based on high-temperature salt-forming phosgenation reaction. Background technique [0002] In the prior art, the phosgene method of preparing isocyanates by reacting organic primary amines with phosgene in an inert solvent is well known. The phosgene method can be divided into a direct method and a salt-forming method. The direct method is to prepare the corresponding isocyanate by directly reacting primary amine and phosgene; An amine salt, and then reacting the amine salt with phosgene can effectively inhibit the production of urea by-products in the photochemical process. [0003] British patent GB1086782A uses the method of salt-forming phosgenation to prepare xylylene diisocyanate. Diamine and hydrogen chloride form a salt at 0-60°C, and hydrochloride phosgenation is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J10/00B01J19/18C07C263/10C07C265/14
Inventor 韩金平尚永华李建峰史培猛黎源华卫琦
Owner WANHUA CHEM GRP CO LTD
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