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Method for preparing liquid product enriched in isosorbide by cracking kelp

A technology for isosorbide and liquid products, applied in the field of preparation of organic chemical raw materials, can solve the problems of complex production process, carbonization, low yield and the like, and achieve the effects of high content and simple process

Inactive Publication Date: 2012-08-01
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the production method of isosorbide is to adopt the method of catalytic dehydration of sorbitol, and the catalyst used is sulfuric acid, and there is carbonization phenomenon in the production process, resulting in low yield
Sorbitol, the raw material for isosorbide production, first extracts starch from biomass, hydrolyzes the starch to obtain sucrose or glucose, and then obtains sorbitol through catalytic hydrogenation; and the latter two steps require the use of catalysts, the entire production process is complicated, and the production cost high

Method used

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  • Method for preparing liquid product enriched in isosorbide by cracking kelp

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Using kelp as a raw material, pulverize it below 80-180 mesh, and carry out raw material preparation, charging, and cracking (cracking time 80 minutes) according to the above steps, the cracking temperature is 300 ° C, and the distillate is collected to obtain a liquid product. The rate is 30.2% (mass percentage, the same below), the isosorbide content is 50.6% (mass percentage, the same below), and the water content is 41.1% (mass percentage, the same below); the gas product yield is 26.0% (mass percentage , the same below), and the semi-coke yield was 43.8% (mass percentage, the same below).

Embodiment 2

[0024] The pyrolysis temperature was set to 350°C, and the same steps as in Example 1 were adopted to collect gas-liquid-solid three-phase products. The yield of liquid product is 24.7%, the content of isosorbide is 51.6%, the moisture content is 39.4%, the yield of gas product is 37.7%, and the yield of semi-coke is 37.6%.

Embodiment 3

[0026] The pyrolysis temperature was set to 400°C, and the same steps as in Example 1 were adopted to collect gas-liquid-solid three-phase products. The yield of liquid product is 28.0%, the content of isosorbide is 61.2%, the moisture content is 45.2%; the yield of semi-coke is 34.4%.

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Abstract

The invention discloses a method for preparing a liquid product enriched in isosorbide by cracking kelp. The liquid product enriched in isosorbide is prepared from kelp used as a raw material by the processes of draining, crushing and separating. The method is characterized by comprising the following steps: putting crushed kelp in a cracking reactor of a fixed bed; carrying out a cracking reaction under the conditions of oxygen deficiency, normal pressure and a reaction temperature of 300-450 DEG C; collecting distillate; and cooling the liquid to obtain a solution enriched in isosorbide. The invention overcomes the defects of long carbonization and flows, expensive raw materials, and the like of the prior art in isosorbide preparation. The method for preparing a liquid product enriched in isosorbide does not need a catalyst, has simple flows, and the obtained liquid product is enriched in the isosorbide which can be extracted through purification and separation.

Description

technical field [0001] The invention relates to a method for preparing organic chemical raw materials, in particular to a method for preparing a liquid product rich in isosorbide by cracking kelp. Background technique [0002] Due to its special chiral characteristics, isosorbide, as an organic intermediate, is widely used in the synthesis of new polymer materials in the fields of electronics and national defense; at the same time, it is also a pharmaceutical intermediate, which itself is a drug, as an oral dehydration diuretic , is mainly used in the treatment of cerebral edema and glaucoma, and has the characteristics of convenient administration and high curative effect. It is also widely used in the preparation of specific drugs such as coronary heart disease, such as nitroisosorbide (Xiaxintong). [0003] At present, the production method of isosorbide adopts the method of catalytic dehydration of sorbitol, and the catalyst adopted is sulfuric acid, and there is carboni...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D493/04
Inventor 陈明强王君陈明功张明旭闵凡飞黄国胜
Owner ANHUI UNIV OF SCI & TECH