Process of preparing multicomponent binary alcohol with corn as material

A multi-component, dihydric alcohol technology, applied in the preparation of organic compounds, chemical instruments and methods, preparation of hydroxyl compounds, etc., can solve the problems that cannot be used as PET polyester raw materials, etc., and achieve the effect of high economic value and industrialization prospects.

Inactive Publication Date: 2007-10-03
DONGHUA UNIV
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

[0003] In view of the existing industrial production technology, the purity of ethylene glycol produced from corn raw materials cannot reach the polymerization grade purity in the petroleum industry, especially the

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Convert 1000 kilograms of corn into starch milk (700 kilograms on a dry basis), in the presence of amylase and glucoamylase, generate about 742 kilograms of 70% liquid glucose with water, cool and crystallize at 24 ° C, and obtain 865 kilograms after centrifugation 60 % tidal sugar solution, then, in the presence of a nickel catalyst, carry out a hydrogenation reaction with hydrogen at 156°C and about 10Mpa to obtain 860 kilograms of sorbitol. Add water to dilute to 25% and mix it with 4% sodium hydroxide at a molar ratio of 8:1, adjust the pH value of the raw material liquid to 13, and the raw material liquid is preheated to 176 °C through a preheater, then enter the reaction kettle, Under the action of a nail cracking catalyst, cracking reaction occurs with the hydrogen produced by cracking methanol at a high temperature of 230 ° C and a high pressure of 12 MPa to obtain 2800 kg of reaction products, which contain water, ethylene glycol, 1,2-propanediol, glycerol, Mix...

Embodiment 2

[0025] The preparation method of the first and second steps from corn starch to multi-component mixed alcohol is as in Example 1. In the third step, in the temperature range of 100 degrees to 194 degrees, the mixture mainly containing 1,2-propanediol is fractionated from the multi-component mixed alcohol; and then in the temperature range of 194 degrees to 204 degrees, interception produced corn-based ethylene glycol known as CEG-97001. In the CEG-97001 corn-based ethylene glycol product, the ethylene glycol content is 97.6%, the 1,2-propanediol content is 0.26%, the 1,2-butanediol content is 0.45%, and the water content is 0.43%.

Embodiment 3

[0027] The preparation method of the first and second steps from corn starch to multi-component mixed alcohol is as in Example 1. In the third step, in the temperature range of 100 degrees to 194 degrees, the mixture mainly containing 1,2-propanediol is fractionated from the multi-component mixed alcohol; and then in the temperature range of 194 degrees to 208 degrees, interception produced corn-based ethylene glycol known as CEG-97002. In the CEG-97002 corn-based ethylene glycol product, the content of ethylene glycol is 97.5%, the content of 1,2-propanediol is 0.37%, the content of 2,3-butanediol is 0.13%, and the content of 1,2-pentanediol The content is 1.53%.

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Abstract

The process of preparing multicomponent binary alcohol with corn as material includes the following steps: 1. converting corn into starch milk, adding water to form 70 % concentration glucose liquid, centrifugally separating, and hydrogenating reaction at 150-160 deg.c under the catalysis of Ni to prepare sorbitol; 2. adding water to dilute to 25 % concentration, mixing with 4 % concentration sodium hydroxide solution in the molar ratio of 8 to 1 to regulate pH value to 12-13, heating to 170-180 deg.c, hydrocracking at 230-240 deg.c and 10-12 MPa under the catalysis of Ni/Ru to obtain multicomponent alcohol; and 3. fractionating at 100-200 deg.c to separate out 1, 2-propylene glycol mixture, and fractionating at 188-210 deg.c to obtain ethylene glycol mixture. The process is simple and suitable for industrial production, and the prepared ethylene glycol mixture is used as material for preparing PDT polyester.

Description

technical field [0001] The invention belongs to the field of corn chemical preparation, in particular to a method for preparing multi-component dihydric alcohol of corn raw material (abbreviated as corn-based ethylene glycol). Background technique [0002] In the polyester fiber manufacturing industry, ethylene glycol, 1,3-propanediol and 1,4-butanediol are the main raw materials for the preparation of important polyester fiber varieties: PET, PTT, and PBT. The existing ethylene glycol, propylene glycol and butylene glycol are all products of the petroleum industry. Utilizing renewable corn resources to solve the main raw materials of the polyester industry - glycols such as ethylene glycol, propylene glycol and butanediol, is a research hotspot at home and abroad, which will reduce people's dependence on petroleum resources and promote the polyester industry. sustainable development is of great significance. At present, in the products containing ethylene glycol, 1,2-prop...

Claims

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Application Information

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IPC IPC(8): C12P7/18C07C29/00C07C29/80C07C31/20
Inventor 徐周文吴嘉麟陈建文
Owner DONGHUA UNIV
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