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A method of removing polymer from and acid gas treating system

An acid gas and polymer technology, applied in the processing of gas mixtures, separation methods, treatment of hydrocarbon oils, etc., can solve problems such as ineffective reduction of regenerator and heat exchanger fouling

Inactive Publication Date: 2005-10-05
EXXONMOBIL CHEM PAT INC
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  • Abstract
  • Description
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Problems solved by technology

[0005] Applicants have found that when absorber towers are used as additional equipment for absorbing acid gases from refinery gases, the polymerization problems are of a different nature than those described in USP 3,696,162, which generally have an initial boiling point of about 80°C Solvents are not effective in reducing fouling in regenerators and heat exchangers

Method used

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  • A method of removing polymer from and acid gas treating system
  • A method of removing polymer from and acid gas treating system

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Embodiment Construction

[0036] a. Laboratory tests have shown that a light aromatic solvent (eg, toluene) dissolves the polymer very effectively, but due to its high volatility, losses in the regenerator overhead can be high. b. 1500 liters of Solvesso 200 (a heavy aromatic solvent having at least 99.8 vol % aromatics content, 80 vol % bicyclic aromatics content, a specific gravity of 1.0 and a boiling point range of 232-277° C.) was added to 20% monoethanolamine in the aqueous solution system. The regenerator was operated at 110°C. Spent solvent is recovered by gravimetric separation.

[0037] The fouling tendency of several heat exchangers was monitored during operation and the results showed an improvement in reducing the fouling tendency of the system. In addition, the aforementioned aromatic solvents have sufficiently high boiling points so as not to contaminate the regenerator overhead. However, due to the small difference in specific gravity between the used solvent and the aqueous alkanola...

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Abstract

A method for removing polymer from an acid gas treating system comprising contacting an acid containing stream with an aqueous alkanolamine solution and hydrocarbon solvent to form a mixture of an alkanolamine rich solution having the acid gases or byproducts thereof contained therein and the hydrocarbon solvent, there the hydrocarbon solvent has about 60 to 100 volume % aromatics content; and about 50 to 85 volume % two ring aromatic content, based on the total volume of the solvent.

Description

Background of the invention [0001] In a typical petrochemical plant with a steam cracker for the pyrolysis of ethane, propane, naphtha, gasoline, and other suitable steam cracking feedstocks, the effluent from the steam cracker contains in addition to desired olefinic products (e.g. , ethylene and propylene) and acid gases such as carbon dioxide, hydrogen sulfide and traces of carbonyl sulfide. To recover the desired product, it is necessary to purify the steam cracker effluent to remove the acid gases, for example, by contacting the effluent with a suitable solvent (eg, an aqueous alkanolamine solution) in an absorber column. In the absorber, the acid gas is absorbed by the aqueous alkanolamine solution to produce an alkanolamine-rich solution, which is withdrawn from the absorber. The alkanolamine-rich solution is then sent to a regenerator where the alkanolamine-rich solution is heated to remove most of the acid gases. The alkanolamine lean solution from the regenerator i...

Claims

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Application Information

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IPC IPC(8): B01D17/038B01D53/14C07C7/11C07C11/00C10G9/00C10G70/06C10K1/14
CPCG06F17/30855C10G70/06G06F16/748Y02P30/40
Inventor D·R·斯利姆E·V·威尔克塞克
Owner EXXONMOBIL CHEM PAT INC
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