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Method for preparing propylene oxide by propylene epoxidation under pressure oscillations

A technology of propylene oxide and epoxidation, which is applied in the direction of organic chemistry, can solve the problems of little feasibility, and achieve the effect of environmental friendliness, less by-products and simple process

Inactive Publication Date: 2011-10-05
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the hydrogen peroxide decomposition experiment that in the presence of a catalyst, hydrogen peroxide will decompose in large quantities above 60°C, so it is not feasible to apply reactive distillation to this system

Method used

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  • Method for preparing propylene oxide by propylene epoxidation under pressure oscillations
  • Method for preparing propylene oxide by propylene epoxidation under pressure oscillations
  • Method for preparing propylene oxide by propylene epoxidation under pressure oscillations

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] use figure 1 The process, the catalyst is TS-1 type titanium silicon molecular sieve, using the commercial product of Sinopec Beijing Petrochemical Research Institute:

[0046] The reactor is a single bubble column, the model of the timer is DH48S-S, and the model of the solenoid valve is MP-C-080; the solenoid valve is opened at a frequency of 5 times per hour, and the holding time is 10 seconds after each opening, and then closed;

[0047] Reaction temperature is 45 ℃, and space time is 240 minutes;

[0048] In hydrogen peroxide-methanol solution, the weight concentration of 30% hydrogen peroxide is 15%;

[0049] The reaction pressure is 0.4Mpa, and it oscillates between 0.4-0.2Mpa, and the oscillation frequency is 5 times / hour;

[0050] The weight ratio of raw material propylene and hydrogen peroxide is: propylene: weight concentration is 30% hydrogen peroxide=1: 2.58;

[0051] The weight ratio of catalyst and hydrogen peroxide is: catalyst: weight concentration i...

Embodiment 2

[0054] use figure 1 The process, the catalyst is TS-1 type titanium silicon molecular sieve, which is a commercial product of Sinopec Beijing Petrochemical Research Institute;

[0055] The reactor is a single bubble column, the model of the timer is DH48S-S, and the model of the solenoid valve is MP-C-080; the solenoid valve is opened at a frequency of 30 times per hour, and the holding time is 1 second after each opening, and then closed;

[0056] Reaction temperature is 55 ℃, and space time is 20 minutes;

[0057] In the hydrogen peroxide-methanol solution, the weight concentration of 30% hydrogen peroxide is 10%;

[0058] The reaction pressure is 0.42Mpa, and it oscillates between 0.42-0.40Mpa, and the oscillation frequency is 30 times / hour;

[0059] The weight ratio of raw material propylene and hydrogen peroxide is: propylene: weight concentration is 30% hydrogen peroxide=1: 0.215;

[0060] The weight ratio of catalyst and hydrogen peroxide is: catalyst: weight concent...

Embodiment 3

[0063] use figure 2 The process, the catalyst is TS-1 type titanium silicon molecular sieve, which is a commercial product of Sinopec Beijing Petrochemical Research Institute

[0064] The reactor is a series reactor with double bubble columns, and the operating conditions of the two reactors are the same.

[0065] The model of the timer is DH48S-S, and the model of the solenoid valve is MP-C-080; the solenoid valve is opened at a frequency of 15 times per hour, and the holding time is 2 seconds after each opening, and then closed;

[0066] The reaction temperature is 50°C, and the space time is 60 minutes;

[0067] In the hydrogen peroxide-methanol solution, the weight concentration of 30% hydrogen peroxide is 12.8%;

[0068] The reaction pressure is 0.38Mpa, and it oscillates between 0.38 and 0.34Mpa, and the oscillation frequency is 15 times / hour;

[0069] The weight ratio of raw material propylene and hydrogen peroxide is: propylene: weight concentration is 30% hydrogen...

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Abstract

The invention provides a method for preparing propylene oxide by propylene epoxidation under pressure oscillations, which comprises the following steps: propylene is fed in from the bottom of a reactor, catalyst and oxydol-methanol solution are fed in from the lower part of the reactor, the catalyst and the oxydol-methanol solution flows upwards, and the liquid-phase product is discharged from the upper part of the reactor; the gas-phase product is sent to a condenser to be condensed through a pipeline connected with the top of the reactor, the propylene obtained after condensation is discharged from a gas-phase outlet of the condenser, the condensate is discharged from a liquid-phase outlet of the condenser, and the gas-phase outlet of the condenser is provided with an electromagnetic valve connected with a timer; the amplitude of the oscillation pressure of the reaction is 0.02-0.20Mpa; and the opening frequency of the electromagnetic valve 5-30 times / hour, and the valve is opened for 1-10 seconds each time. By using the invention, the percent conversion of oxydol can reach more than 98.0%, the selection rate of propylene oxide can reach 88.6%, and thus, the invention has wide prospects for industrial implement.

Description

technical field [0001] The invention relates to a synthesis method of propylene oxide, in particular to a synthesis method of propylene oxide using a titanium silicon molecular sieve as a catalyst. Background technique [0002] Propylene oxide (referred to as PO), also known as methyl oxirane or propylene oxide, is the second largest propylene derivative after polypropylene, and is an important organic chemical raw material. [0003] The largest use of propylene oxide is to produce polyether, and polyether is mainly used to produce polyurethane plastics; secondly, it is used as surfactant, such as crude oil demulsifier, foam stabilizer, etc.; it can also be used as lubricant, heat exchange fluid, etc. Propylene oxide can also be used to produce propylene glycol, which is the main raw material of unsaturated polyester resin and is widely used in industries such as medicine and food. At present, there are nearly 100 kinds of downstream derivative products of propylene oxide, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D303/04C07D301/12
Inventor 袁向前刘强强宋宏宇方飞雷蔡少鸿
Owner EAST CHINA UNIV OF SCI & TECH