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A modified molecular sieve catalyst and its application in treating 3-methyl-3-buten-1-ol high-concentration wastewater

A high-concentration wastewater and molecular sieve technology, which is applied in the direction of molecular sieve catalysts, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve the problems of difficult to realize the reuse of useful substances in wastewater, long treatment process, poor applicability, etc., and achieve reduction Wastewater Treatment Costs and Energy Consumption, Efficiency Improvement, Performance Enhancement Effects

Active Publication Date: 2022-07-12
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above method of wastewater treatment has poor applicability for the treatment of high-concentration wastewater generated by the synthesis of 3-methyl-3-buten-1-ol, and the treatment process is long and costly, and it is difficult to realize the reuse of useful substances in wastewater
[0008] For the shortcoming of above common waste water treatment method and the characteristic of the high-concentration waste water that synthetic 3-methyl-3-buten-1-alcohol generates, be badly in need of developing a kind of method to solve the deficiency in above prior art, avoid waste water treatment to produce Make an impact, recover organic matter in wastewater, simplify wastewater treatment processes, and reduce production costs

Method used

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  • A modified molecular sieve catalyst and its application in treating 3-methyl-3-buten-1-ol high-concentration wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Mix 50g of methyltriethoxysilane and 600g of water, and stir at 50°C for 6 hours to hydrolyze the organosilicon to form Emulsion A; at room temperature, add 20g of zirconium dioxide to 140g of trifluoroacetic acid, and stir Until all the solids are dissolved, solution B is formed; 16.6 g of calcium silicate and 3.4 g of bentonite are fully stirred and mixed for later use; at room temperature, solution B is slowly added to emulsion A, and 10 g of isoleucine is added dropwise at the same time, stirring 35min, add the mixture of calcium silicate and bentonite and stir well for 4h to form a uniform gel; put the gel in an oven, evaporate the water and organic solvent to dryness, grind it into powder and put it in a muffle furnace at 220°C After calcination and crystallization for 6 hours, the catalyst was washed with 4% hydrochloric acid aqueous solution and then washed with ethanol, and finally placed in an oven for drying at 80 °C to obtain a hydrophobically modified molecu...

Embodiment 2

[0046] Mix 32g of hexamethyldisilazane and 650g of water, and stir at 55°C for 5h to hydrolyze the organosilicon to form Emulsion A; at room temperature, add 15g of titanium dioxide to 175g of tetramethylethylenediamine, Stir until all the solids are dissolved to form solution B; fully stir and mix 14g calcium silicate and 2.55g bentonite for later use; at room temperature, slowly add solution B to emulsion A, add 9.6g leucine dropwise, and stir 45min, add the mixture of calcium silicate and bentonite and stir well for 3.5h to form a uniform gel; put the gel in an oven, evaporate the water and organic solvent to dryness, grind it into powder and put it in a muffle furnace at 230°C After calcination and crystallization for 4.5 h, the catalyst was washed with 5% phosphoric acid aqueous solution and then with methanol, and finally put into an oven for drying at 90 °C to obtain a hydrophobically modified molecular sieve catalyst, which is designated as CAT-2.

Embodiment 3

[0048] Mix 26g of tert-butyldimethylsilyl chloride and 700g of water, and stir at 58°C for 4.5h to hydrolyze the organosilicon to form Emulsion A; at room temperature, add 16g of tungsten trioxide to 195g of dimethyl carbonate , stir until all the solids are dissolved to form solution B; fully stir and mix 10.5g calcium silicate and 1.5g bentonite for later use; at room temperature, slowly add solution B to emulsion A, and add 8.5g stearin dropwise at the same time acid, stir for 65 minutes, add calcium silicate and bentonite mixture and stir well for 3 hours to form a uniform gel; put the gel in an oven, evaporate the water and organic solvent to dryness, grind it into powder and put it in a muffle furnace After calcination and crystallization at 235°C for 5h, the catalyst was washed with 3.2% phosphoric acid aqueous solution and then washed with acetonitrile. Finally, it was put into an oven for drying at 95°C to obtain a hydrophobically modified molecular sieve catalyst, den...

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Abstract

The invention provides a preparation method of a hydrophobically modified molecular sieve catalyst. Firstly, metal oxide and silicon source compound hydrolyzate are uniformly mixed, and a mixture of calcium silicate and modifier bentonite is added at the same time, so that the metal oxide can be firmly attached to the catalyst surface. , so that the surface has a large number of coordinatively unsaturated metal sites as Lewis acid sites. In addition, the addition of hydrophobic additives is beneficial to reduce the adsorption of water on the catalyst surface, improve the efficiency of glycol dehydration, and further improve the performance of the catalyst. Utilizing the catalyst to treat the high-concentration wastewater generated in the process of synthesizing 3-methyl-3-butene-1-alcohol by the isobutene method can make the wastewater treatment conditions milder, the treatment efficiency is higher, and the wastewater treatment cost and energy consumption can be greatly reduced.

Description

technical field [0001] The invention relates to a preparation method of a modified molecular sieve catalyst and its application in treating high-concentration wastewater generated during the synthesis of 3-methyl-3-buten-1-ol. Background technique [0002] 3-Methyl-3-buten-1-ol is a starting agent for synthesizing TPEG polyether with side chain of polycarboxylate superplasticizer, and is widely used in the field of superplasticizer. In addition, 3-methyl-3-buten-1-ol is also a raw material for the artificial synthesis of citral, and can further synthesize menthol and its derivatives, ionone, vitamins, flavors and fragrances, etc., so 3-methyl-3- Buten-1-ol has high economic value. [0003] The reaction products of the isobutene process to produce 3-methyl-3-buten-1-ol include 3-methyl-3-buten-1-ol, 3-methyl-2-buten-1-ol and water, para Products include 3-methylene-1,5-pentanediol, (E)-3-methyl-2-pentene-1,5-diol, (Z)-3-methyl-2-pentene -1,5-diol and other impurities, the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/89B01J29/78B01J29/00B01J37/03B01J37/08C02F101/34
CPCB01J29/89B01J29/78B01J29/00B01J37/033B01J37/036B01J37/08B01J2229/183C02F2101/34C02F2209/08
Inventor 庞计昌刘英俊朱小瑞张红涛杨在刚张永振黎源
Owner WANHUA CHEM GRP CO LTD
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