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A dry desulfurization purification process for ethylene-rich gas

A dry desulfurization and ethylene-enriching technology, which is applied in separation methods, gas treatment, chemical instruments and methods, etc., can solve the problems of desulfurization, arsenic removal, and ethylene yield reduction without detailed introduction of desulfurization methods, etc., to achieve Improve the conversion rate of hydrolysis, reduce the loss of ethylene, and reduce the effect of operating costs

Active Publication Date: 2022-04-29
WUHAN KELIN FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Chinese patent CN101633595A discloses a method for recovering ethylene in the catalytic dry gas. The catalytic dry gas from the catalytic cracking unit of the refinery enters the cold box for cooling after removing acid gas, drying and removing NOx and oxygen, and enters heavy hydrocarbons after cooling. In the separation tank, the gas at the tank top enters the cold box again for further cooling, and the liquid at the bottom of the tank is sent to the demethanizer; box to recover the cooling capacity, and then discharged from the cold box, the liquid at the bottom of the flash tank enters the demethanizer; the patent only introduces that the catalytic dry gas needs to be dried for dehydration and removal of NOx and O 2 After entering the cold box, the removal method and removal temperature are not introduced in detail. In addition, the method does not introduce desulfurization, arsenic removal, mercury removal, etc., which still cannot completely solve the problem of blockage and corrosion of the cold box system
This method requires the use of Mo-Ni-S system catalysts, and the reaction temperature must be above 200 °C, which will inevitably aggravate the occurrence of side reactions, resulting in a decrease in the yield of ethylene

Method used

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  • A dry desulfurization purification process for ethylene-rich gas

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Embodiment 1

[0022] The dry desulfurization and purification process of ethylene-rich gas in a refinery in Shandong is shown in the attached figure 1 As shown, the content of ethylene-rich gas and main impurities is shown in Table 1. This comes from upstream 4000Nm 3 / h The ethylene-rich gas first passes through the coalescing filter 1 for rough dehydration, is heated to 80°C by the steam heater 2, and enters the hydrolysis fine desulfurization reactor 3 and the hydrolysis fine desulfurization reactor 4. There are two hydrolysis fine desulfurization reactors, One open and one standby, use in series. The hydrolysis fine desulfurization reactor can be filled with a volume of 9m 3 , the desulfurizer is filled in two layers, and the upper layer is filled with 2m 3 Hydrolysis Catalyst 5 and 4m 3 The fine desulfurizer 6 with iron oxide as the active component, the upper layer is hydrolyzed and finely desulfurized to reduce COS to 0.5ppm, and the lower layer is filled with 2m 3 Hydrolysis Ca...

Embodiment 2

[0024] The dry desulfurization purification process of ethylene-rich gas in a refinery in Shandong is shown in the attached figure 1 As shown, the content of ethylene-rich gas and main impurities is shown in Table 1. This comes from upstream 4000Nm 3 / h The ethylene-rich gas first passes through the coalescing filter 1 for rough dehydration, is heated to 120°C by the steam heater 2, and enters the hydrolysis fine desulfurization reactor 3 and the hydrolysis fine desulfurization reactor 4. There are two hydrolysis fine desulfurization reactors, One open and one standby, use in parallel. The hydrolysis fine desulfurization reactor can be filled with a volume of 9m 3 , the desulfurizer is filled in two layers, and the upper layer is filled with 2m 3 Hydrolysis Catalyst 5 and 4m 3 The fine desulfurizer 6 with iron oxide as the active component, the upper layer is hydrolyzed and finely desulfurized to reduce COS to 0.3ppm, and the lower layer is filled with 2m 3 Hydrolysis Cat...

Embodiment 3

[0026] The dry desulfurization purification process of ethylene-rich gas in a refinery in Shandong is shown in the attached figure 1 As shown, the content of ethylene-rich gas and main impurities is shown in Table 1. This comes from upstream 4000Nm 3 / h The ethylene-rich gas first passes through the coalescing filter 1 for rough dehydration, is heated to 100°C by the steam heater 2, and enters the hydrolysis fine desulfurization reactor 3 and the hydrolysis fine desulfurization reactor 4. There are two hydrolysis fine desulfurization reactors, One open one prepared, parallel connection. The hydrolysis fine desulfurization reactor can be filled with a volume of 9m 3 , the desulfurizer is filled in two layers, and the upper layer is filled with 2m 3 Hydrolysis Catalyst 5 and 4m 3 The fine desulfurizer 6 with iron oxide as the active component, the upper layer is hydrolyzed and finely desulfurized to reduce COS to 0.92ppm, and the lower layer is filled with 2m 3 Hydrolysis C...

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Abstract

The invention discloses a dry desulfurization and purification process for ethylene-rich gas. Ethylene-rich gas can be desulfurized by hydrolysis, fine deoxidation, dehydration and mercaptan removal, arsenic removal, mercury removal and other processes in sequence, and the COS in the raw material can be removed to less than 0.1ppm, O 2 Content less than 1ppm, H 2 O content is reduced to not more than 10ppm, As content is not more than 5ppb, Hg content is not more than 5ppb, NO X It is reduced to less than 10ppb, which meets the needs of subsequent ethylene cold box separation, and the pressure drop of the entire process bed is not greater than 50KPa. The process has the characteristics of simple process, less ethylene loss, high purification precision and low operating cost.

Description

technical field [0001] The invention relates to a dry desulfurization and purification process for ethylene-rich gas, which belongs to the field of petrochemical industry. Background technique [0002] The ethylene content in the dry gas produced by the catalytic cracking unit of the refinery is about 12-20 mol%, and also contains alkenes and alkanes such as ethane, propylene, propane and butane. Most refinery catalytic dry gas is mainly burned as fuel, and its utilization value is low. At present, many refineries preliminarily enrich ethylene by means of pressure swing adsorption to obtain ethylene-rich gas, and remove H through MDEA. 2 The ethylene-rich gas of S cannot be directly sent to the ethylene plant as a product, because the concentrated ethylene gas contains some harmful trace impurities, mainly including COS, RHS, O 2 , NOx, H 2 O, Hg, AsR 3 (mainly AsH 3 )Wait. In order to avoid the above-mentioned impurities from causing blockage and corrosion of the ethy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/75B01D53/86B01D53/48B01D53/56B01D53/81B01D53/52B01D53/64B01D53/04B01D53/26
CPCB01D53/75B01D53/869B01D53/8606B01D53/8628B01D53/81B01D53/52B01D53/64B01D53/0462B01D53/266B01D53/261B01D2255/808B01D2255/20761B01D2255/1026B01D2253/104B01D2253/108B01D2251/60B01D2251/602B01D2257/308B01D2257/406B01D2257/504B01D2257/306B01D2257/80Y02C20/40
Inventor 张先茂王泽赵志杰王瑜王骥飞王天元金建涛陈凯彭渺郑敏周正夏大寒
Owner WUHAN KELIN FINE CHEM
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