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Preparation method for KL molecular sieve catalyst and application of KL molecular sieve catalyst

A technology of molecular sieve and catalyst, which is applied in the field of preparation of KL molecular sieve catalyst, can solve problems such as poor catalytic performance, and achieve the effects of improving utilization rate, promoting diffusion, and high fructose conversion activity

Inactive Publication Date: 2018-06-22
ZHEJIANG SUGAR ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commercial ZSM-5 molecular sieve, Beta molecular sieve and Amberlyst-15 molecular sieve catalysts have their own shortcomings, and their catalytic performance is not good in the fructose dehydration reaction of tetraethylammonium bromide system

Method used

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  • Preparation method for KL molecular sieve catalyst and application of KL molecular sieve catalyst
  • Preparation method for KL molecular sieve catalyst and application of KL molecular sieve catalyst
  • Preparation method for KL molecular sieve catalyst and application of KL molecular sieve catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add potassium hydroxide, sodium hydroxide, and sodium aluminate into deionized water in sequence, and stir at room temperature to form a clear solution A; add silica sol dropwise to solution A, and vigorously stir to form a uniform emulsion B. The moles of each material than K 2 O: Na 2 O: Al 2 o 3 : SiO 2 :H 2 O=5.4:5.7:1:10:500; After standing for 24 hours, the obtained emulsion B was transferred to a stainless steel hydrothermal kettle containing a polytetrafluoroethylene liner, and was heated in an oven at 140 o C for 24 hours of crystallization; the crystallized product was washed with deionized water until the filtrate was neutral, and the solid product was transferred to an oven at 110 o C for 12 hours, then placed in a muffle furnace at 300 o Roasting at C for 5 hours to obtain KL molecular sieves; measure 50 milliliters of 1 M ammonium chloride solution, pour it into a round bottom flask, and heat to 80 o C, then weigh 1 gram of KL molecular sieve and po...

Embodiment 2

[0017] Add potassium hydroxide, sodium hydroxide, and sodium aluminate into deionized water in sequence, and stir at room temperature to form a clear solution A; add silica sol dropwise to solution A, and vigorously stir to form a uniform emulsion B. The moles of each material than K 2 O: Na 2 O: Al 2 o 3 : SiO 2 :H 2 O=2.4:6.7:1:20:500; After standing for 24 hours, the obtained emulsion B was transferred to a stainless steel hydrothermal kettle containing a polytetrafluoroethylene liner, and was heated in an oven at 180 o C for 24 hours of crystallization; the crystallized product was washed with deionized water until the filtrate was neutral, and the solid product was transferred to an oven at 110 o C for 12 hours, then placed in a muffle furnace, 500 o Roasting at C for 5 hours to obtain KL molecular sieves; measure 50 milliliters of 1 M ammonium chloride solution, pour it into a round bottom flask, and heat to 80 o C, then weigh 1 gram of KL molecular sieve and pour...

Embodiment 3

[0019] Add potassium hydroxide, sodium hydroxide, and sodium aluminate into deionized water in sequence, and stir at room temperature to form a clear solution A; add silica sol dropwise to solution A, and vigorously stir to form a uniform emulsion B. The moles of each material than K 2 O: Na 2 O: Al 2 o 3 : SiO 2 :H 2 O=4.8:7.7:1:40:500; After standing for 24 hours, the obtained emulsion B was transferred to a stainless steel hydrothermal kettle containing a polytetrafluoroethylene liner, and was heated in an oven at 160 o C for 24 hours of crystallization; the crystallized product was washed with deionized water until the filtrate was neutral, and the solid product was transferred to an oven at 110 o C for 12 hours, then placed in a muffle furnace at 400 o Roasting at C for 5 hours to obtain KL molecular sieves; measure 50 milliliters of 1 M ammonium chloride solution, pour it into a round bottom flask, and heat to 80 o C, then weigh 1 gram of KL molecular sieve and po...

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Abstract

The invention discloses a preparation method for a KL molecular sieve catalyst. The KL molecular sieve catalyst is prepared by the following steps: adding potassium hydroxide, sodium hydroxide and sodium aluminate into deionized water in sequence, and performing stirring at room temperature to form a clear solution A; adding a silica gel dropwise into the solution A, and performing stirring to form a uniform emulsion B, wherein the molar ratio of K2O to Na2O to Al2O3 to SiO2 to H2O is 5.4:5.7:1:x:500, and the value of x is 1-60; and allowing the obtained emulsion B to stand for 20-36 h, movingthe obtained solution into a stainless steel hydrothermal kettle containing a polytetrafluoroethylene lining, and performing crystallization in a drying oven at the temperature of 120-200 DEG C for 12-36 h. According to the method provided by the invention, the prepared catalyst has high conversion activity of fructose, and greatly improves the yield of 5-hydroxymethylfurfural.

Description

technical field [0001] The invention relates to a preparation method and application of a KL molecular sieve catalyst. Background technique [0002] 5-Hydroxymethylfurfural is an important bio-based chemical raw material intermediate, which is widely used in medicine, plastics, rubber and other fields. The preparation of 5-hydroxymethylfurfural needs to choose a suitable solvent. When water is used as a solvent, a large number of by-products such as levulinic acid and formic acid will be produced, which is not conducive to obtaining a higher yield of 5-hydroxymethylfurfural. Conventional organic solvents such as dimethyl sulfoxide can inhibit the hydrolysis of 5-hydroxymethylfurfural, but are not conducive to the separation and purification of the product. Ionic liquids are expensive, and the cost is too high for industrial applications. Quaternary ammonium salts such as tetraethylammonium bromide, tetrapropylammonium bromide, and acetylcholine are inexpensive, less toxic...

Claims

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Application Information

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IPC IPC(8): C01B39/02B01J29/60
CPCB01J29/60C01B39/02C01P2004/03
Inventor 张建王磊胡耀平胡华雷高志谨
Owner ZHEJIANG SUGAR ENERGY TECH CO LTD
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