Method for producing low-carbon olefin

A technology for low-carbon olefins and olefins is applied in the field of catalytic cracking of ethylene and C3-C8 hydrocarbons to produce propylene. Effect of thermal and hydrothermal stability, good alkane cracking reactivity

Active Publication Date: 2013-05-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is that the prior art has the problems of high reaction temperature, easy coking of olefins contained in the reactants, poor sele

Method used

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  • Method for producing low-carbon olefin
  • Method for producing low-carbon olefin
  • Method for producing low-carbon olefin

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0021] [Example 1]

[0022] First, add 300 grams of hydrogen type ZSM-5 molecular sieve with a silicon-to-aluminum ratio of 100 to a solution consisting of 600 grams of water and 19.5 grams of ammonium dihydrogen phosphate. After immersing and stirring for two hours at room temperature, place in an oven at 80°C overnight, and then 500 Fired at ℃ for 2 hours.

[0023] Add 148 grams of kaolin (15% ignition reduction), add 250 grams of water, soak for 10 minutes, then be beaten for 10 minutes, add 625 grams of aluminum sol (alumina content 20%) and stir for 5 minutes, and add 20% nitric acid to adjust the pH to 3.5 At about the end, 100 grams of PHZSM-5 (Si / Al=100) molecular sieve containing 4% phosphorous oxide is added for 15 minutes to be beaten to obtain a slurry. The slurry was spray-dried and shaped at an inlet air temperature of 600°C and an outlet air temperature of 350°C, and calcined at 650°C to obtain a catalyst. The measured catalyst-to-stack ratio is 0.83 g / ml and the m...

Example Embodiment

[0027] [Example 2]

[0028] The same catalyst and raw materials as in Example 1 were tested under different conditions. The results are shown in Table 2 and Table 3.

[0029] Table 2 Reaction results of different process conditions

[0030]

[0031] Table 3 Reaction results of different process conditions

[0032]

Example Embodiment

[0033] [Example 3]

[0034] Using pure isobutane as the raw material, instead of the raw material of Example 1, the evaluation was carried out, and the results are shown in Table 4.

[0035] Table 4 Reaction results of isobutane raw materials

[0036]

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Abstract

The invention relates to a method for producing a low-carbon olefin, mainly solving the problems that in the prior art, the olefin contained in a reactant is easily coked and the light olefin as a product is poor in selectivity due to the high reaction temperature; and the device productivity is low and the separation cost is high due to the utilization of a large number of diluents. The method provided by the invention comprises the following steps: by taking an aliphatic hydrocarbon flow liquid which is lack of the olefin as a raw material, contacting the raw material with aZSM molecular sieve catalyst to carry out cracking reaction to generate flow liquid rich in propylene and ethylene under the conditions that reaction temperature is 500-700 DEG C, the weight ratio of a diluting agent to the raw material is (0-3):1, reaction pressure is in a range from -0.08 MPa to 0.2MPa and the liquid-phase space velocity is from 0.5 to 15 per hour. According to the adopted technical scheme, the problems are solved well. The method provided by the invention can be applied to the industrial production of the low-carbon olefin.

Description

technical field [0001] The invention relates to a method for producing low-carbon olefins, in particular to a method for producing propylene and ethylene by catalytic cracking of C3-C8 hydrocarbons. Background technique [0002] With the development of the economy, people's demand for basic organic chemical raw materials such as propylene and ethylene is increasing continuously, and the supply of crude oil raw materials is becoming increasingly scarce and deteriorating, which has brought about increasingly prominent contradictions in the production and supply of propylene and ethylene. . On the other hand, mixed C4 and other liquefied gas is a by-product of ethylene plant, refinery FCC unit, methanol to olefins, gasoline (MTP, MTO, MTG) unit, and usually can only be sold as fuel liquefied gas and other low-value products. According to our country's increasing oil refining capacity year by year, its output increases simultaneously. Moreover, with my country's west-to-east g...

Claims

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Application Information

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IPC IPC(8): C07C4/06C07C11/04C07C11/06
CPCY02P20/52
Inventor 金文清滕加伟赵国良杨为民
Owner CHINA PETROLEUM & CHEM CORP
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