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Method for producing propylene by catalytic cracking of C4 olefin

A technology for catalytic cracking and carbon tetraolefin, which is applied in the production of bulk chemicals, chemical instruments and methods, and hydrocarbon cracking to produce hydrocarbons. It can solve the problems of poor catalyst stability and low propylene selectivity, and achieve good technical effects.

Inactive Publication Date: 2017-05-03
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is the problem of poor catalyst stability and low selectivity of propylene in the existing catalytic cracking of C4-olefins to produce propylene, and a new method for producing propylene by catalytic cracking of C4-olefins is provided

Method used

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  • Method for producing propylene by catalytic cracking of C4 olefin
  • Method for producing propylene by catalytic cracking of C4 olefin
  • Method for producing propylene by catalytic cracking of C4 olefin

Examples

Experimental program
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Effect test

Embodiment 1

[0024] With tetrapropylammonium bromide as the template, aluminum nitrate as the aluminum source, and silica sol as the silicon source, the raw materials are first molarally mixed with SiO 2 / Al 2 o 3 =200;OH － / SiO 2 =0.3; R / SiO 2 =0.5;H 2 O / SiO 2 = 40 mixed in a ratio of 40, hydrolyzed completely at room temperature, put into a stainless steel reactor, controlled the growth direction of molecular sieve crystals under hydrothermal conditions, and crystallized at 100°C for 60 hours to obtain the silicon-aluminum molar ratio SiO 2 / Al 2 o 3 NaZSM-5 molecular sieve with a shape index of 200 and a shape index of 50.

[0025] Take by weighing 40 grams of NaZSM-5 molecular sieves prepared above, 25 grams of silica sol (SiO 2 40% by weight), add water and knead, extrude into a mold with a diameter of 1.5 mm, dry, place in an oven at 80°C for 8 hours, and bake in a muffle furnace at 600°C for 6 hours to remove the template agent. Stir in 5% sodium carbonate aqueous solution...

Embodiment 2

[0036] Tetrapropylammonium hydroxide is used as a template, aluminum sulfate is used as an aluminum source, water glass is used as a silicon source, and raw materials are molar ratios of SiO 2 / Al 2 o 3 =500;OH － / SiO 2 =0.05; R / SiO 2 =1.5;H 2 O / SiO 2 = 10 ratio mixing, using the method described in Example 1, crystallized at 80 ° C for 100 hours, to obtain the silicon-aluminum molar ratio SiO 2 / Al 2 o 3 NaZSM-5 molecular sieve with a shape index of 500 and 3.

[0037] Take by weighing 30 grams of NaZSM-5 molecular sieves prepared above, 38 grams of silica sol (SiO 2 weight percent content 40%) and 15 grams of aluminum oxide, add water and knead, with a diameter of 1.5 mm mold extruded molding, dry, placed in 100 ℃ oven for 5 hours, in 600 ℃ muffle furnace roasting 4 hours, Remove templating agent. Stir in 10% sodium hydroxide aqueous solution at 50°C for 3 hours, dry, and bake at 550°C for 4 hours. Exchange three times in 10% ammonium chloride solution at 85°C, d...

Embodiment 3

[0040] Tetraethylammonium chloride is used as a template, sodium aluminate is used as an aluminum source, and tetraethyl orthosilicate is used as a silicon source. The raw material is molar ratio of SiO 2 / Al 2 o 3 =800;OH － / SiO 2 = 1.5; R / SiO 2 =0.02;H 2 O / SiO 2 = 30 ratio mixing, using the method described in Example 1, crystallization at 120 ° C for 50 hours, to obtain the silicon aluminum molar ratio SiO 2 / Al 2 o 3 NaZSM-5 molecular sieve with a shape index of 800 and a shape index of 10.

[0041] Take by weighing 10 grams of NaZSM-5 molecular sieves prepared above, 32 grams of silica sol (SiO 2 40% by weight) and 10 grams of aluminum phosphate, mixed with water, extruded into a mold with a diameter of 1.5 mm, dried, placed in a 120°C oven for 8 hours, and roasted in a 500°C muffle furnace for 8 hours. Remove templating agent. Stir in 5% sodium hydroxide aqueous solution at 60°C for 4 hours, dry, and bake at 550°C for 4 hours. Exchange three times in 10% ammo...

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Abstract

The invention relates to a method for producing propylene by catalytic cracking of C4 olefin. The method mainly solves the problem that the existing catalyst has poor stability and low propylene selectivity. The method comprises forming ZSM-5 molecular sieve raw powder with a shape index of 3-100 from raffinate C4, carrying out alkali treatment to obtain a molecular sieve catalyst having a composite channel structure, and carrying out a reaction process under conditions of a reaction temperature of 400 to 600 DEG C, reaction pressure of 0 to 0.3MPa and a weight airspeed of 1 to 50h<-1>. The method well solves the problem and can be used for industrial production of propylene by catalytic cracking of C4 olefin.

Description

technical field [0001] The invention relates to a method for producing propylene by catalytic cracking of carbon tetraolefins. Background technique [0002] Propylene is an important basic raw material in the petrochemical industry. Driven by the rapid growth of demand for polypropylene and its derivatives, the demand for propylene will continue to grow at a relatively rapid rate in the next few years. Therefore, propylene is considered to be a product with great market potential . Mixed carbon tetraolefins are by-products of FCC units in ethylene plants and refineries. Usually, they can only be used as low-value-added products such as liquefied gas fuels. They can be further processed into propylene and ethylene to make full use of this considerable amount of valuable olefin resources. , both economically and technically feasible. [0003] The active components of catalysts usually used for olefin cracking are molecular sieves such as hydrogen ZSM-5, ZSM-11 or SAPO-34. A ...

Claims

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Application Information

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IPC IPC(8): C07C4/06C07C11/06B01J29/40B01J29/48
CPCY02P20/52
Inventor 任丽萍徐建军滕加伟
Owner CHINA PETROLEUM & CHEM CORP
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