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Fluidized bed reactor for preparing vinyl chloride by hydrogen chloride and acetylene reaction and method

A fluidized-bed reactor and fluidized-bed technology are applied in hydrogen halide addition preparation, chemical instruments and methods, chemical/physical processes, etc., which can solve problems such as poor temperature control and low production intensity, and achieve gas-solid contact. The effect is enhanced, the contact effect is good, and the wear rate is small.

Inactive Publication Date: 2009-09-09
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a new high-efficiency gas distributor and a fluidized bed of components for the reaction of hydrogen chloride and acetylene to prepare vinyl chloride in view of the shortcomings of low reactor production intensity and poor temperature control in the preparation of vinyl chloride in the prior art The device and process method achieve the purpose of efficiently converting acetylene in a fluidized bed reactor

Method used

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  • Fluidized bed reactor for preparing vinyl chloride by hydrogen chloride and acetylene reaction and method

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Effect test

Embodiment 1

[0045] Fix the component (6) on the heat exchange tube (5), connect the gas inlet (2), gas distributor (3), catalyst outlet (4), heat exchange tube (5), catalyst inlet (7), cyclone The separator (8) and the gas outlet (9) are sequentially connected with the cylinder wall of the fluidized bed (1) to form a complete fluidized bed (1). Among them, a tubular gas distributor with a pressure drop of 20% of the pressure drop of the catalyst bed is used; a heat exchange tube with a height of 200% of the catalyst dense phase height and a cross-sectional area of ​​5% of the bed cross-sectional area is used; a void ratio of 90% is used The cross angle between the two layers is 90°, the height is 20% of the diameter of the fluidized bed; the distance between the same layers is 10% of the diameter of the fluidized bed. The particle size is 0.1mm and the specific surface area is 600m 2 / g, the bulk density is 1000kg / m 3 The catalyzer containing mercuric chloride and tin chloride, catalyze...

Embodiment 2

[0048] Fix the component (6) on the heat exchange tube (5), connect the gas inlet (2), gas distributor (3), catalyst outlet (4), heat exchange tube (5), catalyst inlet (7), cyclone The separator (8) and the gas outlet (9) are sequentially connected with the cylinder wall of the fluidized bed (1) to form a complete fluidized bed (1). Among them, a plate gas distributor whose pressure drop accounts for 35% of the pressure drop of the catalyst bed is used; a heat exchange tube whose height is 100% of the catalyst dense phase height and whose cross-sectional area is 30% of the bed cross-sectional area; Components, the intersection angle between two layers of components is 45°, the height is 20% of the diameter of the fluidized bed; the distance between components of the same layer is 1% of the diameter of the fluidized bed. The particle size is 0.05mm and the specific surface area is 1000m 2 / g, the bulk density is 300kg / m 3 catalysts containing mercuric chloride and zinc chlori...

Embodiment 3

[0051] Fix the component (6) on the heat exchange tube (5), connect the gas inlet (2), gas distributor (3), catalyst outlet (4), heat exchange tube (5), catalyst inlet (7), cyclone The separator (8) and the gas outlet (9) are sequentially connected with the cylinder wall of the fluidized bed (1) to form a complete fluidized bed (1). Among them, a float valve gas distributor with a pressure drop of 30% of the catalyst bed pressure drop is used; a heat exchange tube with a height of 150% of the catalyst dense phase height and a cross-sectional area of ​​15% of the bed cross-sectional area is used; a void ratio of 70% is used. % of components, the intersection angle between two layers is 90°, the height is 80% of the diameter of the fluidized bed; the distance between the same layers is 10% of the diameter of the fluidized bed. The particle size is 0.3mm and the specific surface area is 1200m 2 / g, the bulk density is 600kg / m 3 Catalysts containing mercuric chloride and mangane...

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Abstract

The fluidized bed reactor and method for preparing vinyl chloride by reacting hydrogen chloride and acetylene belong to the technical field of chemical process and equipment. The reactor includes a fluidized bed, a reaction raw material gas inlet, a heat exchange tube, a component, a cyclone separator, a reaction gas outlet, a catalyst inlet, and a spent catalyst removal outlet; each piece is connected to the cylinder wall of the fluidized bed in sequence to form Fluidized bed reactor; adding catalyst; feeding hydrogen chloride and acetylene in a molar ratio of 1.01 to 1.1:1, the reaction, acetylene and hydrogen chloride are almost completely converted into vinyl chloride, and enter the subsequent device from the fluidized bed gas outlet through a cyclone separator. The reactor of the invention has simple components, good effect of breaking bubbles and low catalyst wear rate, so that the gas-solid contact effect is greatly enhanced, the conversion of acetylene is promoted, and the produced vinyl chloride product has high purity, so that the burden of subsequent gas separation is reduced. The method has the advantages of saving less investment cost, stable operation of the fluidized bed, simple control, labor saving and environmental protection.

Description

technical field [0001] The invention relates to a fluidized bed reactor equipment and a process method for preparing vinyl chloride by reacting hydrogen chloride and acetylene, belonging to the technical field of chemical process and equipment. Background technique [0002] Vinyl chloride is a monomer for preparing polyvinyl chloride, and it is a very important chemical intermediate. With the wide application of polyvinyl chloride materials in packaging materials and other fields, the output of vinyl chloride and polyvinyl chloride has increased rapidly, and the annual demand in China is about 8-10 million tons. [0003] At present, there are three methods for industrial production of vinyl chloride, that is, to prepare vinyl chloride by reacting acetylene, ethylene or ethane with hydrogen chloride respectively. The source of ethylene is mainly the oil refining industry. Due to the rapid rise in crude oil prices in recent years, the price of ethylene has risen. Although its...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C17/08C07C21/06B01J8/24
Inventor 骞伟中魏小波魏飞师海波罗国华金涌
Owner TSINGHUA UNIV
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