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Method for preparing propylene glycol from propylene

A propylene glycol and propylene technology, which is applied in chemical instruments and methods, hydroxyl addition preparation, organic compound/hydride/coordination complex catalysts, etc., can solve the problems of complex process and many by-products, and achieves maintenance of activity and mitigation of thermal effects. , the effect of shortening the process flow

Active Publication Date: 2012-05-16
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN1678598A proposes a method for continuously preparing propylene glycol, firstly generating propylene oxide and part of propylene glycol through the reaction of propylene and hydrogen peroxide, and then reacting propylene oxide and water in a subsequent thermal coupling tower to prepare propylene glycol in a continuous manner. This method solves the disadvantages that the industrial preparation of propylene glycol takes pure propylene oxide as the starting raw material, the process is complicated, and there are many by-products, but there are still propylene oxides generated from propylene, and the hydration of propylene oxide to prepare propylene glycol is divided into two reactors. lack of progress

Method used

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  • Method for preparing propylene glycol from propylene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In the polymerization kettle, add 5.5g of titanium-silicon molecular sieve powder, 1g of Hβ zeolite, 90g of polymerized monomer styrene and 30g of divinylbenzene, 60g of pore-forming agent liquid wax, stir and mix evenly, when the temperature of the water bath is raised to 60°C, add The initiator was 1.5 g of benzoyl peroxide, and the polymerization reaction temperature was 90° C. for 6 hours to obtain a block titanium-silicon molecular sieve composite catalyst. Then carry out crushing and granulation, select a catalyst with a suitable particle size after screening, add 250 ml of 1,2-dichloroethane to swell, and swell for 5 hours at normal temperature. After pouring out 1,2-dichloroethane, add 200ml of ethyl acetate for solvent extraction, the extraction reaction temperature is 55°C, and the extraction time is 4 hours. The same method is used for three extractions to obtain the titanium-silicon molecular sieve composite catalyst A , and its physical and chemical propert...

Embodiment 2

[0039] In the polymerization kettle, add 15g of titanium-silicon molecular sieve powder, 3g of H-ZSM-5 molecular sieve, 90g of polymerized monomer styrene, 15g of divinyltoluene, 25g of divinylxylene, and pore-forming agent C 5 60g of aliphatic alcohol, stirred and mixed evenly, when the temperature of the water bath was raised to 80°C, 2.0g of initiator azobisisobutanol was added, and the reaction temperature was polymerized at 100°C for 6 hours to obtain a block titanium silicon molecular sieve catalyst. Then carry out crushing and granulation, select a catalyst with a suitable particle size after screening, add 250 ml of 1,2-dichloroethane to swell, and swell for 5 hours at normal temperature. After pouring out the 1,2-dichloroethane, add 200ml of xylene to carry out solvent extraction, the extraction reaction temperature is 55°C, and the extraction time is 4 hours. The same method is used for three extractions to obtain the titanium-silicon molecular sieve composite catalys...

Embodiment 3

[0041] The weight of the titanium-silicon molecular sieve powder in Example 1 was changed to 30 g, and 3 g of mordenite was added, and the rest was the same as in Example 1 to obtain a titanium-silicon molecular sieve composite catalyst C, whose physical and chemical properties are shown in Table 1.

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Abstract

The invention discloses a method for preparing propylene glycol from propylene. The method comprises a step that: under the existence of a titanium silicalite molecular sieve composite catalyst, propylene and hydrogen peroxide are directly subject to an epoxidation and ring-opening hydration one-step reaction in a reactor, such that propylene glycol is prepared. The catalyst is composed of titanium silicalite molecular sieve, acidic molecular sieve and resin. According to the invention, a fixed-bed propylene glycol preparation technology is realized by using the titanium silicalite molecular sieve composite catalyst, wherein propylene glycol directly prepared from propylene. Traditionally, propylene is subject to epoxidation, such that propylene oxide is produced; and propylene oxide is subject to ring-opening hydration, such that propylene glycol is prepared. With the method provided by the invention, problems such as complicated reaction steps and high energy consumption of the traditional two-step reaction are solved, and the reaction efficiency is improved.

Description

technical field [0001] The invention belongs to a preparation method of propylene glycol, which is suitable for the catalytic reaction process in which propylene and hydrogen peroxide are directly subjected to epoxidation and ring-opening hydration to prepare propylene glycol. Background technique [0002] Since the Italian Enichem company first synthesized the lattice oxygen-selective titania-silicon molecular sieve catalyst TS-1 in 1983, it has become a hot spot in the research of oxidation catalysts due to its excellent oxidation selectivity and mild reaction conditions, and this discovery is regarded as environmentally friendly. A major breakthrough in catalyst development. [0003] Titanium-silicon molecular sieve catalysts play a very important role in the epoxidation of olefins. For the epoxidation of low-carbon olefins, the liquid-phase epoxidation process uses titanium-silicon molecular sieves as catalysts and hydrogen peroxide as the oxidant; due to the reaction M...

Claims

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Application Information

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IPC IPC(8): C07C31/20C07C29/04B01J31/38
CPCY02P20/52
Inventor 王海波黎元生勾连科宋丽芝薛冬
Owner CHINA PETROLEUM & CHEM CORP
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