Post-treatment method for washing, drying and calcining SAPO (silicoaluminophosphate) molecular sieve

A molecular sieve and drying technology, applied in the direction of molecular sieve catalyst, molecular sieve and alkali-exchanged phosphate, molecular sieve characteristic silicoaluminophosphate, etc. The effect of dust pollution and low comprehensive energy consumption

Inactive Publication Date: 2014-04-16
CHINA TIANCHEN ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the process of plate and frame filtration has the problems of manpower consumption, large water consumption, and long time consumption. At the same time, the drying and roasting process has problems such as manpower consum...

Method used

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  • Post-treatment method for washing, drying and calcining SAPO (silicoaluminophosphate) molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The SAPO molecular sieve mother liquor A of 500Kg after the crystallization is first filtered with a belt filter section 1, and the mother liquor B is separated, and then washed twice at the second section 2 of the belt filter and the third section 3 of the belt filter. The third section 3 of the belt filter is washed with desalted water E, and the obtained secondary washing liquid C is returned to the second section 2 of the belt filter for washing, and the primary washing liquid is filtered to achieve the purpose of recycling, and finally in the belt filter The filter cake F is formed at the end of the machine; then the filter cake F is dried at 400°C using the rotary flash drying device 4 to form a dry molecular sieve fine powder G with a particle size of 6-12 microns; the dry molecular sieve fine powder G passes through a bag filter 5 After collection, use the rotary kiln 6 to roast the molecular sieve fine powder G. The roasting temperature is 550°C, the roasting ti...

Embodiment 2

[0025] The SAPO molecular sieve mother liquor A of 1200Kg after the crystallization is first filtered with a belt filter section 1, and the mother liquor B is separated, and then washed twice in the second section 2 of the belt filter and the third section 3 of the belt filter. The third section 3 of the belt filter is washed with desalted water E, and the obtained secondary washing liquid C is returned to the second section 2 of the belt filter for washing, and the primary washing liquid is filtered to achieve the purpose of recycling, and finally in the belt filter The filter cake F is formed at the end of the machine; then the filter cake F is dried at 600°C using the rotary flash drying device 4 to form a dry molecular sieve fine powder G with a particle size of 8-13 microns; the dry molecular sieve fine powder G passes through a bag filter 5 After collection, use the rotary kiln 6 to roast the molecular sieve fine powder G. The roasting temperature is 700°C, the roasting t...

Embodiment 3

[0027] The SAPO molecular sieve mother liquor A of 800Kg after crystallization is first filtered with belt filter one section 1, and mother liquor B is separated, and then washed twice at belt filter two section 2 and belt filter three section 3, wherein The third section 3 of the belt filter is washed with desalted water E, and the obtained secondary washing liquid C is returned to the second section 2 of the belt filter for washing, and the primary washing liquid is filtered to achieve the purpose of recycling, and finally in the belt filter The filter cake F is formed at the end of the machine; then the filter cake F is dried at 500°C using a rotary flash drying device 4 to form a dry molecular sieve fine powder G with a particle size of 2-16 microns; the dry molecular sieve fine powder G passes through a bag filter 5 After collection, use the rotary kiln 6 to roast the molecular sieve fine powder G. The roasting temperature is 620°C, the roasting time is 5 hours, and the re...

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Abstract

The invention discloses a post-treatment process for washing, drying and calcining an SAPO (silicoaluminophosphate) molecular sieve. The process is characterized in that aiming at the production characteristics of an SAPO molecular sieve, a crystalized molecular sieve stock solution is filtered by a primary section of a belt filter, and is washed twice by secondary and tertiary sections of the belt filter, and is formed into a filter cake at the tail end of the belt filter; the filter cake is dried by using a spin flash drying device to form dried fine powder; and the dried fine powder is collected by a cloth envelope collector, and is calcined by using a rotary kiln to complete removing an organic amine template agent in a molecular sieve channel, so that the SAPO molecular sieve product with catalytic activity can be obtained. Meanwhile, high-temperature tail gas generated in calcination of the rotary kiln can be used as a heat source and returned to the spin flash drying device. The process has the characteristics of continuous operation, high automatic degree, sufficient utilization of high-temperature heat source, low comprehensive energy consumption, and no dust pollution because dust is operated in closed equipment or pipeline.

Description

technical field [0001] The invention belongs to the technical field of chemical production technology, and in particular relates to a post-treatment method of washing, drying and roasting of SAPO molecular sieves. Background technique [0002] SAPO molecular sieves have good catalytic activity, especially in the development field of methanol to olefins technology. The use of SAPO molecular sieves can realize methanol instead of petroleum as the raw material for the production of olefins, so that the production of olefins can get rid of the excessive dependence on petroleum. It has very important strategic significance for some areas with large coal reserves. [0003] In recent years, SAPO molecular sieves have always been the focus of attention in the field of catalysts and have good application prospects. There have been reports in the literature on the treatment methods of synthetic SAPO molecular sieves. Generally, the more traditional method is as follows, using a pla...

Claims

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Application Information

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IPC IPC(8): C01B39/54C01B37/08B01J29/85
Inventor 钱震马国栋刘俊生王海国陈晨王亮李玉龙
Owner CHINA TIANCHEN ENG
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