A kind of continuous preparation method of isosorbide by sorbitol

A technology of isosorbide and sorbitol, which is applied in the field of continuous preparation of isosorbide, can solve the problems of low utilization rate of raw materials, difficulty in product purification and separation, and difficult guarantee of product quality, and achieve good heat transfer effect and fast reaction rate Effect

Active Publication Date: 2017-04-19
SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problems of batch preparation of isosorbide are low utilization rate of raw materials, unstable preparation process, difficult guarantee of product quality, and difficulty in product purification and separation

Method used

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  • A kind of continuous preparation method of isosorbide by sorbitol
  • A kind of continuous preparation method of isosorbide by sorbitol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The continuous isosorbide preparation device given in Example 1 includes a raw material premixing device 1, a primary dehydration reactor 2, an intermediate dehydration device 3, a secondary dehydration reactor 4, a neutralization deacidification reactor 5, and a refined ) Distillation tower 6, isosorbide condenser 7, desalination and impurity device 8, equipment connecting pipelines, control instruments and accessories, etc. The raw material premixing device 1, the first-level dehydration reactor 2, the second-level dehydration reactor 4, and the neutralization deacidification reactor 5 are tubular equipment with external jackets and chemical fillers; the intermediate dehydration device 3 is set in one Between the second-stage dehydration reactor 2 and the second-stage dehydration reactor 4. The raw materials enter the raw material premixing device 1 in proportion and then enter the primary dehydration reactor 2 and then enter the intermediate dehydration device 3 after...

Embodiment 2

[0035] Embodiment 2 is basically the same as Embodiment 1, except that the intermediate dehydration device 3 is arranged after the secondary dehydration reactor 4, and the primary dehydration reactor 2 and the secondary dehydration reactor 4 are used in series. Example 2 such as figure 2 Shown.

Embodiment 3

[0037] Example 3 is basically the same as Example 1, except that all the materials from the secondary dehydration reactor 4 enter the neutralization deacidification reactor 5, and no unconverted raw materials (sorbitol and anhydrous sorbitol) are recycled back to the system to participate again. Operation of dehydration reaction.

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Abstract

The invention discloses a continuous preparation method of isosorbide. The preparation device used in this method includes: raw material premixing device (1), primary dehydration reactor (2), intermediate dehydration device (3), secondary dehydration reactor (4), neutralization and deacidification reactor (5) , refining (extracting) distillation column (6), isosorbide condenser (7), desalination and impurity device (8), connecting pipelines between equipment, control instruments and various accessories; the preparation process used is sorbitol and dehydration catalyst according to The ratio enters the raw material premixing device (1) and enters the first-stage dehydration reactor (2) after premixing, and then dehydrates through the intermediate dehydration device (3) and then enters the second-stage dehydration reactor (4) to further complete the dehydration reaction; the invention provides The preparation method for preparing isosorbide by dehydration of sorbitol can be used for continuous preparation of isosorbide, and has good product quality, few by-products, high utilization rate of raw materials, stable preparation process and large operation flexibility.

Description

Technical field [0001] The invention relates to a method for preparing isosorbide, in particular to a method for continuously preparing isosorbide by using sorbitol as a raw material. Background technique [0002] Isosorbide is widely used in the fields of medicine, food, cosmetics, plastics and polymers. For example, in medicine, isosorbide is an effective osmotic oral dehydration diuretic; in industry, isosorbide is an important intermediate for the preparation of Span and Tween surfactants. Because of its special chirality, it can be used for It is an intermediate used in the synthesis of liquid crystal materials and is widely used in electronic defense and other fields; in the field of materials, isosorbide can be used to modify polyether, polyester, polyurethane, polycarbonate and other polymers, which can significantly improve polyurethane The optical properties, thermal properties and mechanical properties of isosorbide; the raw material of isosorbide, sorbitol, is widely...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D493/04
CPCC07D493/04
Inventor 吴剑华
Owner SHENYANG INSTITUTE OF CHEMICAL TECHNOLOGY
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