Method for preventing ethylene device gasoline fractionating tower from scale formation and blockage

A technology for an ethylene plant and a fractionation tower is applied in the field of preventing the fouling and clogging of a gasoline fractionating tower of a steam cracking ethylene plant, and can solve the problems of reducing the content or concentration of unsaturated hydrocarbons, fouling and clogging of a gasoline fractionating tower, and not taking into account the large scale and the like. , to achieve the effect of increasing the processing capacity, saving production costs, eliminating scaling and clogging

Active Publication Date: 2011-02-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Among all the technical measures, no consideration is given to greatly reducing the content or concentration of unsaturated hydrocarbons, especially the main precursors (styrenes and indenes) that are the main precursors of fouling and clogging, so as to finally solve the problem of fouling and clogging of gasoline fractionation towers

Method used

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  • Method for preventing ethylene device gasoline fractionating tower from scale formation and blockage
  • Method for preventing ethylene device gasoline fractionating tower from scale formation and blockage
  • Method for preventing ethylene device gasoline fractionating tower from scale formation and blockage

Examples

Experimental program
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Effect test

Embodiment 1

[0028]The test device and method were the same as those in Comparative Example 1. The full-run pyrolysis oil A was used alone as the feed to the simulated pyrolysis gasoline fractionator test device, and the pyrolysis gasoline distillation test was carried out under the operating conditions of the simulated gasoline fractionator to investigate the fouling of the packing in the tower. The difference is that the heavy fraction of pyrolysis gasoline is drawn out in the middle section of the fractionating tower, and the cut point is controlled at 130°C. Other operating conditions are as follows: distillation tower bottom temperature is 250°C, fractionation tower top temperature is 120°C, reflux ratio is 1:1.5, and the range of tower top reflux pyrolysis gasoline fraction is 48°C-130°C. After 96 hours of distillation test, use N 2 Carry out purging fractionation tower, take out the packing in fractionation tower and carry out weighing and analysis, test result is shown in Table 3. ...

Embodiment 2

[0030] The test device and method are the same as those in Comparative Example 1. The full-run pyrolysis oil A is used as the feed material of the simulated pyrolysis gasoline fractionation tower test device alone, and the pyrolysis gasoline distillation test is carried out under the operating conditions of the simulated gasoline fractionation tower to investigate the fouling of the packing in the tower. The same test device and test method as Comparative Example 1. The difference is that the heavy fraction of pyrolysis gasoline is extracted in the middle section of the fractionation tower, and the cut point is controlled at 160°C for distillation. Other operating conditions are as follows: distillation tower bottom temperature is 250°C, fractionation tower top temperature is 120°C, reflux ratio is 1:1, and the range of pyrolysis gasoline fraction refluxed at the top of the tower is 48°C-160°C. After 96 hours of distillation test, use N 2 Carry out purging fractionation tower...

Embodiment 3

[0034] The simulated pyrolysis gasoline fractionation tower test device is the same as that in Comparative Example 1, and the full-cut pyrolysis oil B is used alone as the feed material of the simulated pyrolysis gasoline fractionator test device, and the pyrolysis gasoline distillation test is carried out under the operating conditions of the simulated gasoline fractionator to investigate the fouling of the packing in the tower Situation, test method is the same as comparative example 1, and difference is that the pyrolysis gasoline heavy fraction is extracted in the fractionation tower middle section, and cut point is controlled at 140 ℃, and other operating conditions of distillation are: distillation tower bottom temperature is 250 ℃, fractionation tower top temperature is 120 °C, the reflux ratio is 1:1.6, and the range of the pyrolysis gasoline fraction returned at the top of the tower is 48 °C-140 °C. After 96 hours of distillation test, use N 2 Carry out purging fracti...

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Abstract

The invention relates to a method for preventing an ethylene device gasoline fractionating tower from scale formation and blockage. The method comprises the following steps of: introducing cracked gas into the gasoline fractionating tower; separating materials discharged from the top of the gasoline fractionating tower into the cracked gas, water and cracked gasoline light fraction through a water wash tower; leading out cracked gasoline heavy fraction from the middle part of a rectifying section of the gasoline fractionating tower; performing steam stripping on the material flow at the bottom of the gasoline fractionating tower to obtain cracked tar; returning one part of the cracked gasoline light fraction serving as top reflux to a gasoline distillation tower; and mixing the other partof the cracked gasoline light fraction and the cracked gasoline heavy fraction and then introducing the mixture into a cracked gasoline hydrogenation device. The method provided by the invention has the advantages of preventing the gasoline fractionating tower from scale formation and blockage, effectively prolonging the operating cycle of the gasoline fractionating tower and saving production cost on the basis of not changing the functions of the original gasoline fractionating tower.

Description

technical field [0001] The invention relates to a method for improving the production capacity of a steam cracking ethylene plant, more particularly to a method for preventing fouling and clogging of a gasoline fractionation tower of a steam cracking ethylene plant. Background technique [0002] With the rapid economic growth, my country's demand for ethylene and other low-carbon olefins is increasing. 99% of ethylene products come from steam cracking ethylene process, which is a process of producing ethylene by high-temperature steam cracking of gaseous hydrocarbons and liquid hydrocarbons as raw materials. Among them, the gaseous hydrocarbons are ethane, propane or light hydrocarbons, the liquid hydrocarbons are naphtha, light diesel oil, light gas oil or hydrogenated tail oil, and the distillate range of liquid hydrocarbon raw materials is 40℃~560℃. [0003] The pyrolysis gas reacted in the cracking furnace is cooled by waste heat boiler and quench cooler, and then enter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G75/00C10G7/02
Inventor 崔德春王子军侯焕娣张书红肖荣军李子锋
Owner CHINA PETROLEUM & CHEM CORP
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