Method for producing lower-carbon olefin by fraction of coked diesel oil

A technology for coking diesel and low-carbon olefins, applied in cracking, petroleum industry, catalytic cracking, etc., can solve the problems of high equipment cost and operating cost, and achieve the effect of low investment cost and operating cost, simple process and flexible process plan

Active Publication Date: 2011-05-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the hydrogenation technology used in this method is a high-pressure hydrogenation technology, so the equipment cost and operating cost are relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The raw material oil A mixed with hydrogen enters the hydrofinishing reaction zone, contacts with the hydrofinishing catalyst, and reacts under the same reaction conditions as in Comparative Example 1, and the reaction effluent is separated to obtain hydrocoked diesel oil. The hydrocoked diesel oil enters the atmospheric fractionation tower for fraction separation to obtain a light hydrocoked diesel fraction and a heavy hydrocoked diesel fraction, where the cut point between the heavy hydrocoked diesel fraction and the light hydrocoked diesel is 300°C. The atmospheric fractionation tower is a random packing tower, which adopts batch operation. The obtained heavy hydrocoked diesel fraction is used as raw material to enter the cracking furnace, and in the presence of water vapor, the steam cracking reaction is carried out under the same reaction conditions as in Comparative Example 1, and the reaction products are separated to obtain ethylene, propylene and butane Low ca...

Embodiment 2

[0033] The raw material oil B is mixed with hydrogen and enters the hydrofinishing reaction zone, contacts with the hydrofinishing catalyst, and reacts under the same reaction conditions as in Comparative Example 2, and the reaction effluent is separated to obtain hydrocoked diesel oil, and the obtained hydrofinishing The hydrocoked diesel oil enters the atmospheric fractionation tower for fraction separation to obtain a light hydrocoked diesel fraction and a heavy hydrocoked diesel fraction, where the cut point between the heavy hydrocoked diesel fraction and the light hydrocoked diesel is 310°C. The atmospheric fractionation tower is a random packing tower, which adopts batch operation. The obtained heavy hydrocoked diesel fraction is used as raw material to enter the cracking furnace, and in the presence of water vapor, the steam cracking reaction is carried out under the same reaction conditions as in Comparative Example 2, and the reaction products are separated to obtain...

Embodiment 3

[0039] The raw material oil C mixed with hydrogen enters the hydrofinishing reaction zone, contacts with the hydrofinishing catalyst, and reacts under the same reaction conditions as in Comparative Example 3, and the reaction effluent is separated to obtain hydrocoked diesel oil. The hydrocoked diesel oil enters the atmospheric fractionation tower for fraction separation to obtain a light hydrocoked diesel fraction and a heavy hydrocoked diesel fraction, where the cut point between the heavy hydrocoked diesel fraction and the light hydrocoked diesel is 280°C. The atmospheric fractionation tower is a random packing tower, which adopts batch operation. The obtained heavy hydrocoked diesel fraction is used as raw material to enter the cracking furnace, and steam cracking reaction is carried out in the presence of water vapor. After the reaction products are separated, low-carbon olefins such as ethylene, propylene and butadiene are obtained, and steam cracking The reaction condi...

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PUM

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Abstract

A method for producing low-carbon olefine from coked diesel oil fraction is provided. Heavy hydrogenated coked diesel oil fraction is added into a cracking furnace, steam cracking reaction is carried out in an atmosphere of water steam; the reaction product is separated to get such low-carbon olefines as ethylene, propene and budadiene, wherein, the cutting point between the middle / heavy hydrogenated coked diesel oil fraction and the hydrogenated light coked diesel oil is 260-320 DEG C. The method has not only expanded the application of the coked diesel oil, but also expanded the source of raw materials for making ethylene by steam cracking. The heavy hydrogenated coked diesel oil fraction used in the invention can not only meet the requirement for making high-quality ethylene by steam cracking, but also reduce the BMCI value 4-15 units comparing with full-fraction hydrogenated coked diesel oil, and the one-way recovery of the low-carbon olefines got after cracking can improve 4-7%. The invention has a simple flow process, flexible process scheme, can take full use of the existing industrial device, and is of low investment and operation cost.

Description

technical field [0001] The present invention relates to a method for non-catalytic thermal cracking of hydrocarbon oil with hot gas or hot steam in the absence of hydrogen, more specifically a method for producing light olefins from coker diesel oil fractions. Background technique [0002] With the sustained and high-speed development of my country's national economy, the domestic demand for petrochemical products (triene and triphenyl) has grown steadily in the new century. The process of steam cracking to ethylene has become a leading petrochemical process. As the main product, ethylene, its output The cost and cost will be directly related to the overall economic benefits and technical and economic indicators of my country's petrochemical industry. [0003] In recent years, my country's ethylene production capacity has also increased significantly. By the end of 2004, my country's ethylene production capacity in the entire industry had reached about 6.3 million tons. In re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G11/20
Inventor 崔德春王子军刘自宾
Owner CHINA PETROLEUM & CHEM CORP
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