Process for recovering processing liquids
First Claim
1. A process for recovering a processing liquid from a feed mixture comprising water, a processing liquid having a higher boiling point than water, and at least one component that is less volatile than said processing liquid, comprising:
- providing a stream of said feed mixture;
introducing said stream of said feed mixture into a first heating zone and initially heating said feed mixture to a temperature sufficient to volatilize at least some of said water and at least a portion of said processing liquid, said temperature in said first heating zone being below the decomposition temperature of said processing liquid, to produce a vapor stream comprising said volatilized water and said volatilized portion of said processing liquid, and a residuum comprising said processing liquid and at least some of said at least one less volatile component;
separating said vapor stream from said residuum in a first separation zone;
passing at least a portion of said residuum through a second heating zone at a temperature below the decomposition temperature of said processing liquid to produce a heated, first recycle stream;
reducing the concentration of said less volatile component in said residuum;
admixing said heated recycle stream with said stream of said feed mixture to effect said initial heating of said feed mixture;
treating said vapor stream to recover a water stream and a purified processing liquid stream; and
admixing, by recycle, at least a portion of at least one of said water stream and said purified processing stream with said stream of said feed mixture.
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Accused Products
Abstract
A process for recovering processing liquids such as gas-treating liquids wherein a feed mixture containing the processing liquid, water, and optionally additional components that are more volatile than the processing liquid and components that are less volatile than the processing liquid, is initially heated in a first heating zone to a temperature sufficient to volatilize at least some of the water and a portion of the processing liquid without decomposing the processing liquid to produce a vapor stream containing volatilized water and processing liquid and a residuum containing the bulk of the processing liquid and less volatile component, the vapor stream being separated from the residuum and treated to produce recycle streams of water, purified processing liquid, and low and high boiling liquid fractions recovered from the purified processing liquid.
53 Citations
17 Claims
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1. A process for recovering a processing liquid from a feed mixture comprising water, a processing liquid having a higher boiling point than water, and at least one component that is less volatile than said processing liquid, comprising:
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providing a stream of said feed mixture;
introducing said stream of said feed mixture into a first heating zone and initially heating said feed mixture to a temperature sufficient to volatilize at least some of said water and at least a portion of said processing liquid, said temperature in said first heating zone being below the decomposition temperature of said processing liquid, to produce a vapor stream comprising said volatilized water and said volatilized portion of said processing liquid, and a residuum comprising said processing liquid and at least some of said at least one less volatile component;
separating said vapor stream from said residuum in a first separation zone;
passing at least a portion of said residuum through a second heating zone at a temperature below the decomposition temperature of said processing liquid to produce a heated, first recycle stream;
reducing the concentration of said less volatile component in said residuum;
admixing said heated recycle stream with said stream of said feed mixture to effect said initial heating of said feed mixture;
treating said vapor stream to recover a water stream and a purified processing liquid stream; and
admixing, by recycle, at least a portion of at least one of said water stream and said purified processing stream with said stream of said feed mixture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A process for recovering a processing liquid from a feed mixture comprising water, a processing liquid having a higher boiling point than water, and at least one component that is less volatile than said processing liquid, comprising:
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providing a stream of said feed mixture;
introducing said stream of said feed mixture into a first heating zone and initially heating said feed mixture to a temperature sufficient to volatilize at least some of said water and at least a portion of said processing liquid, said temperature in said first heating zone being below the decomposition temperature of said processing liquid, to produce a vapor stream comprising said volatilized water and said volatilized portion of said processing liquid, and a residuum comprising said processing liquid and at least some of said at least one less volatile component;
separating said vapor stream from said residuum in a first separation zone;
passing at least a portion of said residuum through a second heating zone at a temperature below the decomposition temperature of said processing liquid to produce a heated, first recycle stream;
reducing the concentration of said less volatile component in said residuum;
admixing said heated recycle stream with said stream of said feed mixture to effect said initial heating of said feed mixture;
treating said vapor stream to recover a water stream and a purified processing liquid stream;
separating said purified processing liquid stream into a low boiling liquid fraction and a high boiling fraction; and
admixing, by recycle, at least a portion of at least one of said water stream, said high boiling fraction, and said low boiling fraction with said stream of said feed mixture. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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Specification