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Method for producing 1,6-hexanediol by cracking sorbierite

A technology of hexanediol and sorbitol, which is applied in the field of high-temperature and high-pressure hydrocracking production, can solve the problems of high price, high cost, and complicated manufacturing process, and achieve unique process conditions, mild reaction conditions, and significant economic and social benefits Effect

Inactive Publication Date: 2012-01-11
郸城财鑫糖业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no large-scale production manufacturer in China, and the domestic market demand mainly depends on imports. The production methods of 1,6-hexanediol on the market are all produced with petroleum as the initial raw material, and the main production process is to use adipic acid di Methyl ester is obtained by high-temperature and high-pressure hydrogenation, while dimethyl adipate is produced from petroleum products, so the price is very expensive, the manufacturing process is complicated, and the cost is high
1,6-Hexanediol is mostly used in the production of pesticides pyrethrins, organic peroxides, cyclic musks, polyethylene plastic crosslinking agents and polyether rubbers. The dosage is relatively large and the price is relatively expensive.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A method for producing 1,6-hexanediol by cracking sorbitol, comprising the following steps:

[0026] (1) Handling of raw materials

[0027] mixing sorbitol with water, the weight ratio of the mixed sorbitol in water is 30-50%, and the pH is controlled at 11-13;

[0028] (2) Heating

[0029] Heat the mixture to 170-210°C;

[0030] (3) Cleavage reaction

[0031] The heated mixture is subjected to a high temperature and high pressure hydrocracking reaction in the presence of a nickel / cobalt catalyst, the temperature of the cracking reaction is controlled to be 180-230°C, the reaction pressure is 8-11Mpa, and the reaction time is 25-40 minutes;

[0032] (4) Lysate dehydration

[0033] After the cleavage reaction is completed, all the water in the cleavage product is removed;

[0034] (5) Separation of 1,6-hexanediol

[0035] The 1,6-hexanediol in the cracked product after dehydration is separated from other products, and the 1,6-hexanediol product is collected.

[00...

Embodiment 2

[0038] A method for producing 1,6-hexanediol by cracking sorbitol, comprising the following steps:

[0039] (1) Handling of raw materials

[0040] Sorbitol is mixed with water, the weight ratio of the mixed sorbitol in water is 45%, sodium hydroxide is added to control the pH at 11.8, and the described sorbitol is made of common corn starch, which is liquefied and saccharified to generate glucose. produced by rehydrogenation;

[0041] (2) Heating

[0042] Heat the mixture to 190°C;

[0043] (3) Cleavage reaction

[0044] The heated mixture is subjected to a high-temperature and high-pressure hydrocracking reaction in the presence of a nickel / cobalt catalyst. The temperature of the cracking reaction is controlled to be 200°C, the reaction pressure is 10Mpa, and the reaction time is 30 minutes;

[0045] (4) Lysate dehydration

[0046] After the cleavage reaction is completed, all the water in the cleavage product is removed through the dehydration tower;

[0047] (5) Separ...

Embodiment 3

[0051] A method for producing 1,6-hexanediol by cleavage of sorbitol, wherein the weight ratio of sorbitol solution in the aqueous phase is 50%, the pH is 11, the temperature of the cleavage reaction is 230°C, and the reaction pressure is 11Mpa, The reaction time was 25 minutes. The dehydration and separation described in steps (4), (5) are carried out continuously in the dehydration rectification tower. Others are the same as embodiment 1.

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PUM

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Abstract

The invention discloses a method for producing 1,6-hexanediol by cracking sorbierite. The method comprises the following steps of: in the presence of a high-efficiency nickel alloy catalyst, performing high-temperature high-pressure hydrocracking on the sorbierite in an aqueous phase to obtain the 1,6-hexanediol and other products; and separating and refining to obtain the single 1,6-hexanediol product. The cracking method has mild reaction conditions, mixed alcohol mainly containing C4-6 dihydric alcohol is produced by alleviating the hydrocracking, and the chemical product is prepared from the renewable starchy material, namely the sorbierite instead of oil resources, so the production method is novel, the process conditions are unique, and the economic and social benefits are obvious.

Description

technical field [0001] The invention relates to a method for producing 1,6-hexanediol from starchy raw materials, in particular to a method for producing sorbitol from common cornstarch and then producing 1,6-hexanediol by high-temperature and high-pressure hydrogenation cracking. Background technique [0002] 1,6-Hexanediol is a newly emerging important fine chemical raw material. It has more and more applications in the fields of polyurethane, polyester, coil coating, and light curing. It is known as the new cornerstone of organic synthesis. Foreign production is mainly monopolized by Germany's BASF, Bayer, and Japan's Ube. However, there is no large-scale production manufacturer in China, and the domestic market demand mainly depends on imports. The production methods of 1,6-hexanediol on the market are all produced with petroleum as the initial raw material, and the main production process is to use adipic acid di Methyl ester is obtained by high-temperature and high-pr...

Claims

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Application Information

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IPC IPC(8): C07C31/20C07C29/60
Inventor 仵树仁李霄峰王晓飞李锦王念详陆启明闫锁巴艳霞罗文杰朱姝宾张旗丁雁鑫
Owner 郸城财鑫糖业有限责任公司