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Production method for enhancing selectivity of methanal

A production method and selective technology, which can be used in chemical instruments and methods, preparation of organic compounds, catalysts for physical/chemical processes, etc., and can solve the problems of cost reduction, small investment, and high methanol consumption.

Inactive Publication Date: 2012-05-23
山东拓博塑料制品有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Silver method formaldehyde production has low power consumption, small investment, and less formic acid content in the product, but the unit consumption of methanol is high, and formaldehyde contains a considerable part of methanol, which is not good for cost reduction and formaldehyde purity, and is mainly used for the production of low-concentration formaldehyde (37 % or so), there are certain limitations in production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] First, mix methanol vapor (23.36kg / h) at 120°C with water vapor (7.01kg / h) and air (30.24kg / h) at 140°C, preheat to 160°C, -1 Methanol space velocity ratio is passed into the reactor. The weight of the silver catalyst in the reactor is 1.41kg, the purity is 99.9%, the diameter of the catalytic bed is 12.7cm, the thickness is 12.7mm, and the particle size of the silver particles is 20-80 mesh. The catalytic temperature on the silver surface is 620°C-630°C. The product obtained was formaldehyde gas, the gas was cooled and diluted with water (26.40 kg / h) to give 37% formaldehyde. During the reaction process, the conversion rate of methanol is 87%, the selectivity of formaldehyde is 92.1%, the unit consumption of methanol is 470kg, and the residual amount of methanol is 10.4%.

Embodiment 2

[0018] First, mix methanol vapor (23.36kg / h) at 120°C with water vapor (7.01kg / h) and air (40.32kg / h) at 140°C, preheat to 160°C, -1 Methanol space velocity ratio is passed into the reactor. The weight of the silver catalyst in the reactor is 1.41kg, the purity is 99.9%, the diameter of the catalytic bed is 12.7cm, the thickness is 12.7mm, and the particle size of the silver particles is 20-80 mesh. The catalytic temperature on the silver surface is 620°C-630°C. The product obtained was formaldehyde gas, the gas was cooled and diluted with water (26.40 kg / h) to give 37% formaldehyde. During the reaction process, the conversion rate of methanol is 97%, the selectivity of formaldehyde is 84%, the unit consumption of methanol is 480kg, and the residual amount of methanol is less than 2%.

Embodiment 3

[0020] Catalytic bed composition: The catalytic bed is composed of tubes with a diameter of 12.7cm. The weight of the first silver catalytic bed is 1.41kg, the purity is 99.9%, the thickness is 12.7mm, and the silver particle size is 20-80 mesh. The thickness of the second layer of copper catalyst is 45.8 mm, the weight is 4.24 kg, and the particle size of copper particles is 20-80 mesh. The catalyst was activated with hydrogen gas at 200°C for 30 minutes before use.

[0021] First, mix methanol vapor (23.36kg / h) at 120°C with water vapor (7.01kg / h) and air (30.24kg / h) at 140°C, preheat to 160°C, -1 Methanol space velocity ratio is passed into the reactor. The catalytic temperature on the silver surface is 620°C-630°C. After the first step of silver catalysis, 87% methanol was converted. Then, the product obtained by silver catalysis in the first step reaction is directly fed to the surface of the copper catalyst in the second step to undergo a dehydrogenation reaction, so...

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Abstract

The invention relates to a method for producing methanal by catalyzing methanol with a silver-copper double-layer catalyst in an oxidation mode. The reaction of methanol vapor, water vapor and air is carried out by a silver-copper two-step catalysis method at the space velocity ratio of 10,000-120,000 h<-1> and the temperature of 500-700 DEG C. The method comprises the following steps: the mixed vapor is firstly introduced to the silver catalyst in the first layer to obtain a product, and the product is directly introduced to the copper catalyst in the second layer. The combined catalyst enhances the conversion rate of the methanol and the selectivity of the methanal.

Description

technical field [0001] The invention relates to a method for producing industrial formaldehyde, especially formaldehyde with high selectivity and low alcohol formaldehyde. Background technique [0002] Formaldehyde is an important basic organic raw material. In the chemical industry, it is mostly used as a raw material for the production of urea-formaldehyde resins, phenolic resins, polyoxymethylene and melamine resins, and secondly for the production of vinylon, 1,4-butanediol, trimethylol Products such as propane, pentaerythritol, urotropine, pyridine and isoprene. In addition, formaldehyde can also be used in the production of synthetic fragrances, paper treatment agents, dye auxiliaries, antiseptics, reducing agents, medical supplies, chelating agents and explosives, and can also be used as a urea-formaldehyde slow-acting fertilizer in agriculture . [0003] The main methods for producing formaldehyde include methanol oxidation, direct alkane oxidation, dimethyl ether ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C47/055C07C47/052C07C45/38B01J23/72B01J23/50
Inventor 章庆乐杨丰科夏亚穆易香发吴华元丁新芳
Owner 山东拓博塑料制品有限公司
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