A kind of method of catalytic cracking of straight-run diesel oil

A catalytic cracking and straight-run diesel technology, applied in the field of straight-run diesel catalytic cracking, can solve the problems of low yield of low-carbon olefins, high reaction temperature, low conversion rate of diesel, etc. The effect of the one-way cycle

Active Publication Date: 2022-03-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are generally one or more deficiencies such as low conversion rate of diesel oil, low yield of low-carbon olefins, and high reaction temperature.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Using nano ZSM-5 shaped catalyst, without adding diluent gas, using straight-run diesel without removing basic nitrogen compounds for catalytic cracking

[0043] A method for catalytic cracking of straight-run diesel oil, comprising the steps of:

[0044] A. Pack the ZSM-5 type micron shaped catalyst into the constant temperature section of the fixed-bed reactor heating furnace, and use nitrogen (high-purity nitrogen, water content below 10ppm) to activate the catalyst for 4 hours at a temperature of 500°C;

[0045] B. After pretreatment (activation treatment) finishes, feed straight-run diesel oil in reactor, carry out catalytic cracking reaction, generate low carbon olefin;

[0046] The mass space velocity of the catalytic cracking reaction is 2h -1 , the temperature of the catalytic cracking reaction is 500°C, and the pressure of the catalytic cracking reaction is 0.1MPa.

[0047] The yield and effect of straight-run diesel catalytic cracking products are as follow...

Embodiment 2

[0049] Using nano ZSM-5 shaped catalyst, without adding diluent gas, using straight-run diesel catalytic cracking to remove basic nitrogen compounds

[0050] A method for catalytic cracking of straight-run diesel oil, comprising the steps of:

[0051] A. Add acidic substance solid powder in straight-run diesel oil to carry out pretreatment for removing basic nitrogen compounds; described acidic substance is sodium dihydrogen phosphate, and its adding quality of solid powder is 2.5% of straight-run diesel oil quality.

[0052] B. Pack the ZSM-5 type micron-shaped catalyst into the constant temperature section of the fixed-bed reactor heating furnace, and use nitrogen (high-purity nitrogen, water content below 10ppm) at 500 ° C to activate the catalyst for 4 hours;

[0053] C. after the pretreatment (activation treatment) finishes, pass into the straight-run diesel oil that removes basic nitrogen compound in the reactor, carry out catalytic cracking reaction, generate light olef...

Embodiment 3

[0057] Use nano ZSM-5 shaped catalyst, add diluent gas, and use straight-run diesel to remove basic nitrogen compounds for catalytic cracking

[0058] A method for catalytic cracking of straight-run diesel oil, comprising the steps of:

[0059] A. Add acidic substance solid powder to the straight-run diesel oil to carry out pretreatment for removing basic nitrogen compounds; the acidic substance is sodium dihydrogen phosphate, and the solid powder adding quality is 1% of the straight-run diesel oil quality.

[0060] B. Pack the ZSM-5 type micron-shaped catalyst into the constant temperature section of the fixed-bed reactor heating furnace, and use nitrogen (high-purity nitrogen, water content below 10ppm) at 500 ° C to activate the catalyst for 4 hours;

[0061] C. After the pretreatment (activation treatment) finishes, feed straight-run diesel oil and nitrogen for removing basic nitrogen compounds in the reactor, carry out catalytic cracking reaction, and generate low-carbon ...

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Abstract

The invention discloses a method for catalytic cracking of straight-run diesel oil. The method comprises the following steps: step 1, adding acidic substances to straight-run diesel oil to perform pretreatment for removing basic nitrogen compounds; step 2, adding ZSM-5 nanometer molecular sieve The catalyst is put into the reactor for pretreatment; step 3, after the pretreatment is completed, feed straight-run diesel oil and inert diluent gas into the reactor at the same time to carry out catalytic cracking reaction to generate low-carbon olefins; the acidic substance is diphosphoric acid One or two of the group consisting of sodium hydrogen phosphate and potassium dihydrogen phosphate, the amount of acidic substances added is 1%-5% of the mass of straight-run diesel oil; the inert diluent gas is composed of nitrogen, helium and argon One or more of the groups, the molar ratio of the straight-run diesel to the inert diluent gas is 1:0.1-1. The direct-flow diesel catalytic cracking method of the present invention can increase the conversion rate of diesel oil and the yield of low-carbon olefins, and can prolong the one-way cycle of the catalyst.

Description

technical field [0001] The invention relates to the technical field of catalytic cracking of straight-run diesel oil, in particular to a method for catalytic cracking of straight-run diesel oil. Background technique [0002] Under the current situation, increasing the production of gasoline, reducing the production of diesel oil, and adjusting the structure of chemical raw materials are the leading directions for the structural adjustment of refining products. The traditional steam cracking process consumes a lot of energy, and the output ratio of propylene / ethylene produced by cracking has always been lower than the demand ratio of propylene / ethylene, and the supply capacity of propylene is insufficient. With the growth rate of ethylene demand, the proportion of cracking raw materials will not change greatly, so the current situation that the propylene produced by steam cracking cannot meet the demand will continue. The growing propylene market has promoted the rapid devel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G11/05C10G55/06B01J29/40
CPCC10G11/05C10G55/06B01J29/40C10G2300/202C10G2400/20
Inventor 许江刘家旭田亮王小强程中克杨利斌常桂祖孟宏穆珍珍张志红
Owner PETROCHINA CO LTD
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