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Method and device for recycling nitric acid

A nitric acid and pickling technology, which is applied in the direction of nitric acid, chemical instruments and methods, purification/separation of hydrocarbons, etc., can solve problems not involved in the recovery of products in nitric acid, improve processability, reduce total nitrogen emissions, and reduce The effect of alkali consumption

Pending Publication Date: 2022-01-11
SINOPEC ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] It can be seen from the technology disclosed in the above patent application that the existing nitric acid recovery method only realizes the concentration of nitric acid or the removal of impurities in nitric acid, and does not involve the recovery of products in nitric acid

Method used

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  • Method and device for recycling nitric acid
  • Method and device for recycling nitric acid
  • Method and device for recycling nitric acid

Examples

Experimental program
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Effect test

Embodiment 1

[0046] A device for decolorizing crude styrene (such as figure 2 shown), including crude styrene feed pipeline, acid washing unit 1, alkali washing unit 2, water washing unit 3, decolorized styrene production pipeline, separation tower I7 and separation tower II 8, wherein the crude styrene feed pipeline, Pickling unit 1, alkali washing unit 2, water washing unit 3, and decolorized styrene production pipelines are connected in sequence,

[0047] Pickling unit 1 is connected to separation tower I7 through an acid-containing wastewater feed pipeline, the top of separation tower I7 is connected to separation tower II8, the top of separation tower II is connected to alkali washing unit 2, and the bottom of the tower is connected to pickling unit 1.

[0048] Use the above-mentioned device to recover nitric acid. Specifically, in the future, the crude styrene 6 will undergo pickling, alkali washing and water washing in order to obtain decolorized styrene 4. The acid-containing wast...

Embodiment 2

[0052] A device for decolorizing crude styrene (such as image 3 shown), including crude styrene feed pipeline, acid washing unit 1, alkali washing unit 2, water washing unit 3, decolorized styrene production pipeline, separation tower I7 and separation tower II 8, wherein the crude styrene feed pipeline, Pickling unit 1, alkali washing unit 2, water washing unit 3, and decolorized styrene production pipelines are connected in sequence,

[0053] Pickling unit 1 is connected to separation tower I7 through an acid-containing wastewater feed pipeline, the top of separation tower I7 is connected to alkali washing unit 2, the bottom of the tower is connected to separation tower II8, and the top of separation tower II8 is connected to pickling unit 1.

[0054] Use the above-mentioned device to recover nitric acid. Specifically, in the future, the crude styrene 6 will undergo pickling, alkali washing and water washing in order to obtain decolorized styrene 4, and the acid-containing ...

Embodiment 3

[0057] A device for decolorizing crude styrene (such as Figure 4 shown), including crude styrene feed pipeline, pickling unit 1, alkali washing unit 2, water washing unit 3, decolorized styrene production pipeline, separation tower I7, separation tower II8 and separation tower III15, wherein the crude styrene The feed pipeline, pickling unit 1, alkali washing unit 2, water washing unit 3, and decolorized styrene production pipeline are connected in sequence,

[0058] Pickling unit 1 is connected to separation tower I7 through the acid-containing wastewater feed pipeline, the top of separation tower I7 is connected to alkali washing unit 2, the bottom of the tower is connected to separation tower II8, the top of separation tower II8 is connected to separation tower III15, and the top of separation tower II8 is connected to separation tower III15. The top of the III15 tower is connected to the alkali washing unit 2, and the bottom of the tower is connected to the acid washing u...

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Abstract

The invention belongs to the field of chemical engineering, and particularly discloses a method and a device for recovering nitric acid. The method comprises conveying acid-containing wastewater to a separation tower to successively discharge hydrocarbons and nitric acid, and the acid-containing wastewater comprises 10-70 wt% of nitric acid and less than or equal to 10 wt% of hydrocarbons. The method for recovering the nitric acid is applied to a crude styrene decolorizing process, and the acid-containing wastewater generated in the pickling process of the crude styrene decolorizing process is separated and utilized again, so that the nitric acid and the styrene can be recovered, the consumption of alkali can be reduced, the wastewater discharge amount of an existing crude styrene decolorizing device can be reduced, and therefore, the total nitrogen discharge amount of the wastewater of the existing crude styrene decolorizing device is greatly reduced, and the treatability of the wastewater in the crude styrene decolorizing process is improved.

Description

technical field [0001] The invention belongs to the field of chemical industry, and more specifically relates to a method and device for recovering nitric acid. Background technique [0002] At present, the crude styrene decolorization unit of the domestic styrene extraction device has two processes: inorganic acid and organic acid decolorization. Among them, the nitric acid wastewater produced by the inorganic acid decolorization process has a large content of nitric acid, and this part of nitric acid needs to be neutralized with lye It is converted into nitrate before entering the wastewater treatment plant for further treatment. The discharge of this acid-containing wastewater not only causes a waste of nitric acid, but also a waste of neutralizing lye. The nitrogen-containing salt wastewater produced after neutralization is difficult to treat. [0003] CN201310413412.3 relates to a method for recovering dilute nitric acid, comprising the following steps: the dilute nitri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C7/17C07C7/148C07C7/04C07C15/46C01B21/46
CPCC07C7/17C07C7/1485C07C7/04C07C7/005C01B21/46C07C15/46
Inventor 朱超白焱王鑫泉
Owner SINOPEC ENG