CN209917842U

CN209917842U - Propylene epoxidation sectional reaction device

Info

Publication number: CN209917842U
Application number: CN201920437119.3U
Authority: CN
Inventors: 孙红影; 李进; 王炳春; 王贤彬
Original assignee: Dalian Heterogeneous Catalyst Co Ltd
Current assignee: Dalian Heterogeneous Catalyst Co Ltd
Priority date: 2019-04-02
Filing date: 2019-04-02
Publication date: 2020-01-10
Anticipated expiration: 2029-04-02

Abstract

The utility model relates to a propylene epoxidation sectional reaction device, including the reactor, raw materials propylene after the blender mixes, methyl alcohol and hydrogen peroxide solution mixture get into from the feed inlet the reactor, the reactor sets up threely the feed inlet, reactor inlayer pipe wall is the ripple pipe wall, cavity between reactor inlayer pipe wall and the outer pipe wall fills circulative cooling medium, be reaction zone in the reactor inlayer pipe wall, the catalyst divides the three-section to load in proportion in the reaction zone, load the filler between every section catalyst. The utility model discloses corrugated pipe wall greatly increased heat transfer area is favorable to the transfer of reaction heat, adopts syllogic catalyst to fill and syllogic feed mode, is favorable to the dispersion release of reaction heat. The effective control of the reaction heat reduces the ineffective decomposition of hydrogen peroxide in the propylene epoxidation reaction, reduces the potential safety hazard, improves the selectivity of the propylene oxide and the effective utilization rate of the hydrogen peroxide, and is suitable for industrial production.

Description

Propylene epoxidation sectional reaction device

Technical Field

The utility model belongs to the chemical industry field, concretely relates to propylene epoxidation sectional reaction device.

Background

Propylene oxide, also known as methyl propylene oxide or propylene oxide, is the third largest propylene derivative besides polypropylene and acrylonitrile, and is an important basic organic chemical raw material. The method is mainly used for producing polyether polyol, propylene glycol ether, propylene carbonate, isopropanolamine, 1, 4-butanediol, propylene glycol and the like, is a main raw material of a nonionic surfactant, an oil field demulsifier, a pesticide emulsifier and the like, and has wide application in the industries of automobiles, buildings, food, tobacco, medicines, cosmetics and the like.

Currently, the industrial production methods of propylene oxide mainly include chlorohydrination method, co-oxidation method, cumene oxidation method (CHP method) and hydrogen peroxide direct oxidation method (HPPO method), wherein the HPPO method is the key and popular in current research and development because of environmental protection and no pollution, and is mature day by day, thus showing good industrialization prospects.

The HPPO method is a new process for synthesizing the propylene oxide by taking hydrogen peroxide and propylene as raw materials, overcomes the defects of serious corrosion of chlorohydrin equipment and more waste liquid and waste residue, has simple process flow and high product yield, only generates the propylene oxide and water in the production process, discharges less three wastes, belongs to an environment-friendly clean production process, and is the development direction of industrial production of the propylene oxide.

In the process of producing propylene oxide by using an HPPO method, a large amount of heat is released in the reaction, so that the actual reaction temperature is far higher than the set temperature, the hydrogen peroxide is seriously decomposed, and the generated oxygen has great hidden trouble in the production process. And when the reaction temperature is high, the content of by-products generated by the reaction is increased, the selectivity of propylene oxide is low, and carbon deposition of the catalyst is caused, so that the service life of the catalyst is influenced.

In addition, the mutual solubility of the propylene, hydrogen peroxide and the solvent is poor, which affects the reaction result, so the mixing effect of the raw materials in the reaction process needs to be improved.

In order to solve the problem, the utility model provides a propylene epoxidation sectional reaction device

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a propylene epoxidation segmentation reaction unit, the device not only can improve the miscibility of raw materials, and the most important can remove the reaction heat effectively, and then improves reactivity and catalyst life-span.

The technical scheme of the utility model as follows:

the utility model discloses a propylene epoxidation sectional reaction device, including the reactor, raw materials propylene after the blender mixes, methyl alcohol and hydrogen peroxide solution mixture get into from the feed inlet the reactor, the reactor sets up threely the feed inlet, reactor inlayer pipe wall is the ripple pipe wall, cavity between reactor inlayer pipe wall and the outer pipe wall fills circulative cooling medium, be reaction zone in the reactor inlayer pipe wall, the catalyst divides the three-section to load in proportion in the reaction zone, load the filler between every section catalyst.

Preferably, the reactor is a fixed bed reactor, a tubular reactor or a tower reactor.

Preferably, the catalyst is filled in three sections, and the filling amount from bottom to top accounts for 50-70% of the total mass: 20-30%: 10 to 20 percent.

Preferably, the catalyst is a titanium silicalite.

Preferably, the packing section below each section of catalyst is communicated with one feed inlet, the raw materials are divided into three paths and enter the packing section at the lower part of the three sections of catalysts of the reactor through a mixer, and the mass proportion and the size sequence of the raw materials of the three paths are the same as the filling proportion and the size sequence of the catalysts.

Preferably the mixer is a membrane tube mixer or a feed microchannel mixer.

Preferably, the material of the corrugated pipe wall of the reactor is carbon steel or stainless steel.

Preferably, the circulating cooling medium is water.

Preferably, the filler is ceramic balls or glass balls.

The technical effects of the utility model:

the utility model discloses corrugated pipe wall greatly increased heat transfer area is favorable to the transfer of reaction heat, adopts syllogic catalyst to fill and syllogic feed mode, is favorable to the dispersion release of reaction heat. The effective control of the reaction heat reduces the ineffective decomposition of hydrogen peroxide in the propylene epoxidation reaction, reduces the potential safety hazard, improves the selectivity of the propylene oxide and the effective utilization rate of the hydrogen peroxide, and is suitable for industrial production.

Drawings

FIG. 1 is a diagram of a propylene epoxidation staged reaction apparatus.

Wherein, 1-propylene; 2-hydrogen peroxide and methanol mixture; 3-a mixer; 4-a filler; 5-a catalyst; 6-corrugated pipe wall; 7-a cooling medium; 8-outer pipe wall, 9-reactor.

Detailed Description

The present invention will be described in further detail with reference to examples, but the present invention is not limited thereto.

Referring to the attached drawing 1, the propylene epoxidation sectional reaction device comprises a reactor, raw materials of propylene 1, methanol and hydrogen peroxide mixture 2 mixed by a mixer 3 enter the reactor from feed inlets, the reactor is provided with three feed inlets, the inner-layer pipe wall of the reactor is a corrugated pipe wall 6, a cavity between the inner-layer pipe wall 6 and an outer-layer pipe wall 8 of the reactor is filled with a circulating cooling medium 7, a reaction zone is arranged in the inner-layer pipe wall of the reactor, catalysts 5 are filled in the reaction zone in three sections according to a proportion, and fillers 4 are filled between each section of catalysts.

Preferably, the catalyst 5 is filled in three sections, and the filling amount from bottom to top accounts for 50-70% of the total mass: 20-30%: 10 to 20 percent.

Preferably, the catalyst is a titanium silicalite.

Preferably, the packing section below each section of catalyst is communicated with one feed inlet, the raw materials are divided into three paths and enter the packing section at the lower part of three sections of catalysts 5 of the reactor through a mixer 3, and the mass proportion and the size sequence of the raw materials of the three paths are the same as the filling proportion and the size sequence of the catalysts.

Preferably, the mixer 3 is a membrane tube mixer or a feed microchannel mixer.

The material of the corrugated pipe wall 6 of the reactor is preferably carbon steel or stainless steel.

Preferably, the circulating cooling medium 7 is water.

Preferably, the filler 4 is a ceramic ball or a glass ball.

Example 1

The mass percentage of the total catalyst filling amount in the fixed bed reactor from bottom to top is 50%: 30%: 20 percent, the corresponding three-section feeding of the mixture of propylene, hydrogen peroxide and methanol accounts for 50 percent of the total mass from bottom to top: 30%: 20 percent of raw materials enter a reactor through a film tube mixer, glass ball fillers are filled among catalysts, the catalysts are titanium silicalite molecular sieves (TS-1), sampling analysis is carried out after the reaction is stable, the conversion rate of hydrogen peroxide is 99.8 percent, the selectivity of propylene oxide is 98.5 percent, and the effective utilization rate of the hydrogen peroxide is 95.4 percent.

Example 2

The mass percentage of the total catalyst filling amount from bottom to top in the fixed bed reactor is 70%: 20%: 10 percent, the corresponding three-section feeding of the mixture of propylene, hydrogen peroxide and methanol accounts for 70 percent of the total mass from bottom to top: 20%: 10 percent of raw materials enter a reactor through a film tube mixer, glass ball fillers are filled among catalysts, the catalysts are titanium silicalite molecular sieves (TS-1), sampling analysis is carried out after the reaction is stable, the conversion rate of hydrogen peroxide is 99.8 percent, the selectivity of propylene oxide is 97.7 percent, and the effective utilization rate of the hydrogen peroxide is 93.8 percent.

Claims

1. The utility model provides a propylene epoxidation sectional reaction device, includes the reactor, the raw materials propylene after the blender mixes, methyl alcohol and hydrogen peroxide solution mixture gets into from the feed inlet the reactor, its characterized in that, the reactor sets up three the feed inlet, reactor inlayer pipe wall is the ripple pipe wall, the cavity between reactor inlayer pipe wall and the outer pipe wall is filled the circulation cooling medium, be the reaction zone in the reactor inlayer pipe wall, the catalyst divides the three-section to fill in the reaction zone according to the proportion, every section pack between the catalyst.

2. The propylene epoxidation sectional reaction device as claimed in claim 1, wherein said reactor is a fixed bed reactor, a tubular reactor or a tower reactor.

3. The propylene epoxidation sectional reaction device as claimed in claim 1, wherein the catalyst is loaded in three stages, and the loading from bottom to top accounts for 50-70% of the total mass: 20-30%: 10 to 20 percent.

4. The staged propylene epoxidation reaction device as claimed in claim 1, wherein said catalyst is a titanium silicalite.

5. The propylene epoxidation sectional reaction device as claimed in claim 1, wherein the packing section below each section of catalyst is communicated with one of said feed inlets, and said raw material is divided into three sections which are fed into the three packing sections below said catalyst in the reactor through a mixer, and the mass ratio and the size order of said raw material of said three sections are the same as the packing ratio and the size order of said catalyst.

6. The propylene epoxidation staged reaction device as claimed in claim 1, wherein said mixer is a membrane tube mixer or a feed microchannel mixer.

7. The propylene epoxidation staged reaction device as recited in claim 1, wherein the wall of said reactor bellows is made of carbon steel or stainless steel.

8. The propylene epoxidation staged reaction device as recited in claim 1, wherein said circulating cooling medium is water.

9. The propylene epoxidation staged reaction device as claimed in claim 1, wherein said filler is ceramic balls or glass balls.