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Purification method of preparing 1,2-propylene glycol by glycerine hydrogenation

A purification method and technology of propylene glycol, which are applied in 1 field and can solve the problems of many side reactions, low reaction conversion rate of propylene oxide, high price of propylene oxide, etc.

Active Publication Date: 2011-03-23
SHANGHAI HUAYI NEW MATERIAL
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Problems solved by technology

Although the direct non-catalytic reaction hydration technology of propylene oxide and water is adopted to avoid the defect of catalytic hydrolysis process with sulfuric acid, the theoretical atom utilization rate is high, but there are many side reactions, the separation process is also complicated, and the reaction conversion rate of propylene oxide is low. Separation energy consumption is high, raw material propylene oxide is expensive

Method used

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  • Purification method of preparing 1,2-propylene glycol by glycerine hydrogenation

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Embodiment 1

[0026] According to the five -tower process separation process of the present invention, the reactor from 20kg / h from the hydrogenation reactor was first pumped into the dehydration tower with raw materials [2].Under the condition that the temperature of the bottom of the tower is 130 ° C, the vacuum is 75kPa and the return ratio 1, the ingredients on the top of the tower are 6.5kg / h to remove the condenser, part of the refluxDilute agent.Contains a small amount of low -boiling dot -meterol, a wastewater 3 to remove the sewage treatment plant.It is shown in Table 2.The material of the tower is sent to the light group to divide the tower [4].

[0027] Table 2 The quality composition of the material on the top of the dehydration tower ( %)

[0028] water

Methanol

Ethanol

Propylene

Hydroxylcetone

1, 2-meterol

Alcohol

98.60

0.54

0.47

0.13

0.01

0.08

0.01

[0029] Divide the tower with a light group [4] mainly ...

Embodiment 2

[0045] water

[0046] Other conditions are performed according to the method 1 of the Example 1.See Table 8 for separation and purification results.

[0047] Table 8 The purification result of the biological glycerin hydrogen reaction product (the quality composition of the top material, %)

[0048] Distilled tower

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Abstract

The invention relates to a purification method for products of 1, 2-propylene glycol prepared through glycerol hydrogenation. A hydrogenation product contains water, a small amount of monohydric alcohol (methanol, ethanol and propanol), hydroxyacetone, glycol, unconverted glycerol and other compounds; after five steps of vacuum rectification, namely dehydration, light-removing component, heavy-removing component, glycol removal and product refining, are carried out to the reaction products of the composition, the purity of obtained 1, 2-propylene glycol products is greater than 99.9 percent, and the separation yield coefficient of the 1, 2-propylene glycol products is greater than 95 percent; unconverted glycerol and materials containing glycol are sent to a recycling treatment system; light components containing hydroxyacetone and other substances are returned to a reactor as raw material of hydrogenation.

Description

Technical field [0001] The invention involves the separation and refining method of 1,2-propylene glycol. Specifically, the reaction product of the 1,2-proply glycol reaction product prepared by glycerin catalyzed hydrogen is used as the method of specifically producing high-purity 1,2-propylene glycol. Background technique [0002] 1, 2-propylene glycol is an important chemical raw material. It is mainly used to manufacture unsaturated polyester, followed by plasticizers, food additives, tobacco dampness agents and antifreeze.At present, the main method of industrial manufacturing 1,2-propylene glycol is to use oxylene oxide at 150 ~ 160 ℃, stay time of 30 minutes, 1.2 ~ 1.4MPa pressure, and generate water solution containing about 1,2-propion glycol, mainly the main part of the sub-solution.The reaction is to generate diexol (DIG) and triathol (TPG) and a small amount of larger molecular weight. The reaction product is evaporated and distilled by the product.Although oxylene ox...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C31/20C07C29/74
Inventor 张春雷张庆怀刘书举宁春利刘汉勇袁海英
Owner SHANGHAI HUAYI NEW MATERIAL
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