Process and system for re-refining unqualified liquid ammonia in oil refinery wastewater production

A technology of refinery wastewater and qualified liquid, which is applied in the field of re-refining system and operation process, can solve the problems of unstable and difficult liquid ammonia production and impurity content, avoid repeated heating and cooling, reduce waste heat discharge, and process flexible and efficient Effect

Active Publication Date: 2018-10-09
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under abnormal production conditions, the output and impurity content of liquid ammonia are unstable, and it is difficult to reuse the oily product to the original refining unit

Method used

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  • Process and system for re-refining unqualified liquid ammonia in oil refinery wastewater production
  • Process and system for re-refining unqualified liquid ammonia in oil refinery wastewater production
  • Process and system for re-refining unqualified liquid ammonia in oil refinery wastewater production

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Embodiment

[0041] In order to illustrate the re-refining system and process of refining waste liquid ammonia of the present invention, the specific operation steps and instructions are as follows:

[0042] About 15,000 tons / year of unqualified liquid ammonia products in an oil refinery, the composition is liquid ammonia (wt%) 98%, C 5 -C 7 Light oil, water and phenolic residues total (wt%) 2%, hydrogen sulfide 50ppm, adopt the re-refining system of this application to purify liquid ammonia.

[0043] (1) 1900kg / h unqualified liquid ammonia 17 enters the liquid ammonia rectification tower 1, heats through the first-stage reboiler 7 of the liquid ammonia rectification tower, and the second-stage reboiler 6 heats with low-pressure steam to separate oil, water, and phenolic impurities.

[0044] (2) After refining, the ammonia gas with a purity of 99.8% is decompressed from the top of the tower to 1.58MPa by the pressure reducing valve 16 and enters the primary adsorption tank 2, and is adso...

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Abstract

Provided are a re-refining process and system for use with unqualified liquid ammonia in oil refining waste water production. The system comprises: a liquid ammonia rectification tower (1), a first level adsorption tank (2), a second level adsorption tank (3), an extraction tower (8) and an ammonia recovery tower (11), wherein connection relationships and a gas-liquid direction are as follows: a middle part of the liquid ammonia rectification column (1) which separates liquid ammonia from impurities is provided with a feed port, a material circulating port at a tower base of the liquid ammonia rectification tower (1) is connected to a feed port of a first level reboiler (7) at the tower base, a discharge port of the first level reboiler (7) is connected to a feed port of a second level reboiler (6), a material discharge port of the second level reboiler (6) is connected to a circulating feed port of the liquid ammonia rectification tower (1), and a heavy material discharge port at the tower base of the liquid ammonia rectification tower (1) is connected to a feed port of the extraction tower (8). The system may accurately adjust an operation process according to the impurity content of liquid ammonia to be processed such that the treatment process for unqualified liquid ammonia becomes more flexible and efficient. Further comprised is a re-refining process, which uses distillation technology to remove oil, adsorption technology to remove H 2 S and like gas phase impurities, an extraction method to remove residue such as phenols and the like, thereby making the purification and reuse of unqualified liquid ammonia a reality.

Description

technical field [0001] The invention belongs to the technical field of chemical separation engineering, and relates to a re-refining system and an operation process for producing unqualified liquid ammonia in an oil refining process, and uses distillation, adsorption, extraction and other purification technologies to realize the purification of liquid ammonia. Background technique [0002] The acid sewage produced by hydrocracking, hydrofining, aromatics extraction and other devices in the refining process is treated by sewage stripping and ammonia refining, and the produced liquid ammonia is used as a by-product of the refinery to improve economic benefits. The sewage stripping unit is divided into two-tower process and single-tower process, and the double-tower process deacidification tower produces high-concentration H 2 S, sulfur-containing crude ammonia is produced from the deammonization tower, and H is produced from the top of the single-tower process 2 S, crude ammo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01C1/02
CPCC01C1/024
Inventor 李洪韩祯李鑫钢高鑫丛山
Owner TIANJIN UNIV
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