Method for removing propane before cracking of naphtha and propane to be coupled with PHD

A naphtha and depropanization technology, which is applied in the direction of chemical instruments and methods, hydrocarbons, hydrocarbons, etc., can solve the problems of poor ability to respond to market changes, unreasonable product structure, and single raw material structure, so as to avoid raw material Risk of cost, good technical effect and economic benefit, effect of short technological process

Inactive Publication Date: 2019-05-17
SINOPEC SHANGHAI ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is the problem of lengthy separation process, large footprint, high fixed investment, unreasonable product structure, single raw material structure, and poor ability to respond to market changes in the p...

Method used

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  • Method for removing propane before cracking of naphtha and propane to be coupled with PHD
  • Method for removing propane before cracking of naphtha and propane to be coupled with PHD
  • Method for removing propane before cracking of naphtha and propane to be coupled with PHD

Examples

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Comparison scheme
Effect test

Embodiment 1

[0021] Adopt the method that depropanization and PDH couple before a kind of naphtha and propane cracking of the present invention, technological process is as follows:

[0022] (1) Ethylene plant reaction system: cracking raw materials naphtha and propane enter the steam thermal cracking unit, and are cracked in the ethylene cracking furnace into cracked gas mixed with hydrocarbons and sent to the quenching unit. After the pyrolysis gas is quenched and washed in the quenching unit, the pyrolysis gasoline and pyrolysis fuel oil are sent out of the boundary as by-products, and the rest of the pyrolysis gas is sent to the compression and alkali cleaning unit for compression, alkali washing, and drying, and then sent to the downstream separation system.

[0023] (2) Reaction system of PDH unit: fresh propane raw material is mixed with the circulating propane raw material from the bottom of the propylene rectification tower and the top material of the deoiling tower, and then enter...

Embodiment 2

[0033] The ethylene unit of the present invention still adopts the pre-depropanization separation process, and uses naphtha and propane as cracking raw materials. The nominal capacity of ethylene is 1 million tons / year, and the nominal capacity of PDH unit is 600,000 tons / year. After adopting the integrated coupling method of the present invention, the load of the ethylene plant equipment is increased, as shown in Table 2.

[0034] Table 2 Lifting load list of ethylene plant equipment after integration

[0035] serial number

[0036] After adopting the integrated coupling method of the present invention, the polymer grade ethylene is more than 99.95 wt%, and the ethylene output is 1,000,000 tons / year; the polymer grade propylene is more than 99.6 wt%, and the propylene output is 943,600 tons / year. Compared with Comparative Example 2, the consumption of naphtha is saved by 2.3303 million tons per year, the consumption of propane is increased by 1.9989 million tons per...

Embodiment 3

[0040] The ethylene unit of the present invention still adopts the pre-depropanization separation process, and uses naphtha and propane as cracking raw materials. The nominal capacity of ethylene is 1.2 million tons / year, and the nominal capacity of PDH unit is 600,000 tons / year. After adopting the integrated coupling method of the present invention, the load of the ethylene plant equipment is increased, as shown in Table 3.

[0041] Table 3 Lifting load table of ethylene plant equipment after integration

[0042] serial number

[0043] After adopting the integrated coupling method of the present invention, the polymer grade ethylene is ≥99.95 wt%, and the ethylene output is 1.20 million tons / year; the polymer grade propylene is ≥99.6 wt%, and the propylene output is 1,028,500 tons / year. Compared with Comparative Example 3, the consumption of naphtha is saved by 2.7964 million tons per year, the consumption of propane is increased by 2.3986 million tons per year, and...

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Abstract

The invention relates to a method for removing propane before cracking of naphtha and the propane to be coupled with PHD. The problems of lengthy separation process, large occupied area, high fixed investment, unreasonable product structure, single raw material structure and poor ability to cope with the market changes in the prior art are mainly solved. According to the technical scheme of the method for removing the propane before cracking of the naphtha and the propane to be coupled with the PHD, on the premise of relying on existing separation equipment of ethylene plants and maintaining the same ethylene capacity, for the ethylene plants with 800 to 1.5 million tons per year, investment of 4-9 hundred million yuan is saved after coupling, the occupied area is decreased by 1.8 hectares, the 6-13 hundred million yuan per year price difference of products and raw materials is saved, the problems are well solved, and the method can be applied to process coupling of removing the propane before cracking of the naphtha and the propane to be coupled with the PHD.

Description

technical field [0001] The invention relates to a method for coupling depropanization and PDH before naphtha and propane cracking, which is a method for coupling a propane dehydrogenation PDH unit with an ethylene unit of a depropanization separation process before naphtha and propane cracking; fully relying on ethylene The existing separation equipment of the depropanization separation process before the device, and under the premise of keeping the total ethylene production capacity unchanged, realize the coupling of the PDH device and the ethylene device, thereby reducing equipment investment and construction land. The present invention uses propane to replace most of the naphtha, can reduce the operating cost of the process production device, fully improve the requirements of the process production device to adapt to market changes, and can be applied to the industrial production of ethylene, propylene and low-carbon olefins. Background technique [0002] Ethylene product...

Claims

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Application Information

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IPC IPC(8): C07C5/333C07C4/04C07C11/04C07C11/06
Inventor 周茹英张永生彭婷婷
Owner SINOPEC SHANGHAI ENG
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