Method for increasing yield of propylene and ethylene
A technology of ethylene and propylene, which is applied in chemical instruments and methods, bulk chemical production, molecular sieve catalysts, etc. It can solve the problems of low economic value and achieve the effect of increasing economic benefits and increasing production
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Embodiment 1
[0040] On the basis of Comparative Example 1, add a catalytic cracking system that uses carbon tetraolefins and alkane mixtures in the steam cracking process as raw materials. The catalytic cracking system is mainly composed of olefin catalytic cracking reactors, mixed olefins and alkane catalytic cracking reactors ,details as follows:
[0041] (1) At first the butane and butene mixture in Comparative Example 1 are passed in the catalytic cracking reactor 1 (olefin catalytic cracking reactor), the carbon tetraolefins in the raw material contact with the olefin catalyst and react at a reaction temperature of 550° C. Pressure (gauge pressure) 0.15Mpa, space velocity is 3 hours -1 The catalytic cracking reaction is carried out under the conditions, and the catalyst catalytically cracks 70% carbon tetraolefins in the feed into stream 1 rich in propylene and ethylene, wherein the content of propylene in stream 1 is 30.72%, and the content of ethylene is 9.6%. The olefin catalytic ...
Embodiment 2
[0060] On the basis of comparative example 1, increase a catalytic cracking system with catalytic cracking gasoline as raw material (raw material composition is shown in Table 2), the processing capacity of the cracked gasoline of this catalytic cracking system is 50,000 tons / year, this catalytic cracking system consists of Two catalytic cracking reactors constitute, specifically as follows:
[0061] Table 2. Composition of FCC gasoline
[0062]
[0063] (1) First pass the catalytic cracking gasoline into the catalytic cracking reactor 1, the olefins of the catalytic cracking gasoline are contacted with a specific catalyst 1, and the olefin catalytic cracking catalyst is a small grain modified with phosphorus and / or alkaline earth metal (particle diameter is less than 800 nanometers) ZSM-5 molecular sieve type catalyst, the composition of catalyst is: 5wt%P, 1wt%La, 64wt%ZSM-5 molecular sieve (silicon-aluminum ratio is 100, and particle diameter is 500 nanometers), 30wt% ox...
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