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Method for continuous production of propylene oxide by hydrogen peroxide direct oxidation of propylene

A technology of propylene oxide and hydrogen peroxide, applied in chemical recycling, organic chemistry and other directions, can solve the problems of a large amount of waste water and waste residue, high equipment cost, high process operation pressure, etc., to reduce load, maintain continuity, and reduce energy consumption. Effect

Active Publication Date: 2016-02-03
HENAN JUNHUA DEV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The methods for industrial production of propylene oxide mainly include the chlorohydrin method and the co-oxidation method. The chlorohydrin method has a mature production process and does not require high purity of raw material propylene, but a large amount of waste water and waste residues are produced in the production process. With people's awareness of environmental protection This method will be eliminated; although the co-oxidation method overcomes the shortcomings of the chlorohydrin method with a large amount of waste water and waste residue, it is also severely restricted due to the high requirements for propylene purity, high process operation pressure, and high equipment cost.

Method used

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  • Method for continuous production of propylene oxide by hydrogen peroxide direct oxidation of propylene
  • Method for continuous production of propylene oxide by hydrogen peroxide direct oxidation of propylene
  • Method for continuous production of propylene oxide by hydrogen peroxide direct oxidation of propylene

Examples

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example 1

[0023] like figure 1 Shown flow process, the massfraction of the technical grade propylene of 500Kg / h, 981.2Kg / h is 27.5% hydrogen peroxide aqueous solution and solvent methyl alcohol, enter fluidized bed circulation main reactor 1 through pipeline 104,101 and 102 respectively, catalyst storage The catalyst in the tank 8 enters the main fluidized bed circulation reactor 1 at a flow rate of 50Kg / h, wherein the molar ratio of propylene:hydrogen peroxide:methanol is 1.5:1:16, the fluidized bed circulation main reactor 1 and the slurry stirring secondary reactor 2 The reaction temperature is 20°C, the reaction pressure is maintained at 0.6MPa, the stirring rate of the slurry stirring secondary reactor 2 is 80rpm, and the unreacted oxygen-containing material at the top of the fluidized bed circulation main reactor 1 and the slurry stirring secondary reactor 2 Propylene is merged in the pipeline 109, and the recycled methanol solvent is used to spray and absorb oxygen-containing pro...

example 2

[0025] like figure 1 Shown flow process, the massfraction of the technical grade propylene of 500Kg / h, 1226.6Kg / h is 27.5% hydrogen peroxide aqueous solution and solvent methyl alcohol, enter fluidized bed circulation main reactor 1 through pipeline 104,101 and 102 respectively, catalyst storage The catalyst in the tank 8 enters the fluidized bed circulation main reactor 1 at a flow rate of 50Kg / h, wherein the molar ratio of propylene:hydrogen peroxide:methanol is 1.2:1:8, the fluidized bed circulation main reactor 1 and the slurry stirring secondary reactor 2 The reaction temperature is 45 ℃, the reaction pressure is maintained at 0.1MPa, the stirring rate of the slurry stirring secondary reactor 2 is 60rpm, and the unreacted oxygen-containing gas at the top of the fluidized bed circulation main reactor 1 and the slurry stirring secondary reactor 2 Propylene is merged in the pipeline 109, and the recovered methanol solvent is used to absorb oxypropylene in the bubbling absorp...

example 3

[0027] like figure 1 Shown flow process, the massfraction of the technical grade propylene of 500Kg / h, 1468.3Kg / h is 27.5% hydrogen peroxide aqueous solution and solvent methyl alcohol, enter fluidized bed circulation main reactor 1 through pipeline 104,101 and 102 respectively, catalyst storage The catalyst in the tank 8 enters the fluidized bed circulation main reactor 1 at a flow rate of 50Kg / h, wherein the molar ratio of propylene:hydrogen peroxide:methanol is 1.0:1:24, the fluidized bed circulation main reactor 1 and the slurry stirring secondary reactor 2 The reaction temperature is 50°C, the reaction pressure is maintained at 1.0MPa, the stirring rate of the slurry stirring secondary reactor 2 is 100rpm, and the unreacted oxygen-containing gas at the top of the fluidized bed circulation main reactor 1 and the slurry stirring secondary reactor 2 Propylene is merged in the pipeline 109, and after absorbing oxygen-containing propylene with the recovered methanol solvent in...

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Abstract

The invention discloses a technological process for continuously producing propylene oxide by directly oxidizing propylene with hydrogen peroxide. The whole procedure is divided into four working procedures namely a reaction process, a propylene oxide purification process, a catalyst separation and concentration process and a methanol and oxygen-containing propylene recovery and byproduct separation process, wherein in the reaction process, a fluidized bed circulation flow main reactor and a slurry stirring auxiliary reactor which are connected with each other in series are adopted; a molecular sieve fine particle catalyst is applied; discharged slurry passes through a flash tank to evaporate propylene and propylene oxide; oxygen-containing propylene remained after reaction is synchronously recycled in an absorber by using a solvent methanol recycling process; catalyst particles are separated by virtue of a membrane separator to achieve regeneration and then return to the reactor to be recycled. The process disclosed by the invention achieves the stability and continuity of the production of propylene oxide by directly oxidizing propylene with hydrogen peroxide.

Description

technical field [0001] The invention relates to a process flow for the continuous production of propylene oxide by directly oxidizing propylene with hydrogen peroxide aqueous solution as the oxidant, methanol as the solvent, and fine-grained titanium-silicon molecular sieve as the catalyst. The process belongs to a new energy-saving, green and clean continuous production of propylene oxide . Background technique [0002] The methods for industrial production of propylene oxide mainly include the chlorohydrin method and the co-oxidation method. The chlorohydrin method has a mature production process and does not require high purity of raw material propylene, but a large amount of waste water and waste residues are produced in the production process. With people's awareness of environmental protection This method will be eliminated; although the co-oxidation method overcomes the shortcomings of the chlorohydrin method with a large amount of waste water and waste residue, it is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07D301/12C07D303/04
CPCC07D301/12C07D303/04Y02P20/584
Inventor 汤广斌刘灏郑强徐向前李新丽温贻强武春阳
Owner HENAN JUNHUA DEV
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