Caprolactam causticization device

A technology of caprolactam and causticization, which is applied in the field of refining and separation of chemical products, can solve the problems of undiscovered mixing and absorption, unsolved ammonia absorption problems, etc., and achieve the effects of reducing investment costs, small pipeline resistance loss, and reducing floor space

Active Publication Date: 2012-02-01
CHINA PETROLEUM & CHEM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent uses calcium hydroxide as causticizing agent, which reduces the cost of causticizing agent, but does not solve the problem of ammonia absorption
No patents and scientific literature reports have been found on the use of venturi tubes for the mixing and absorption of ammonia gas and liquids in the production of caprolactam

Method used

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  • Caprolactam causticization device
  • Caprolactam causticization device
  • Caprolactam causticization device

Examples

Experimental program
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Effect test

Embodiment 1

[0016] Caprolactam causticizing device of the present invention such as figure 1 As shown, it is mainly composed of a causticizing reactor 4 , a circulation pump 3 , a Venturi mixer 2 and a mother liquor circulation pipeline 16 . like image 3 , Figure 4 As shown, the Venturi tube mixer includes a Venturi tube, 8 ammonia gas nozzles 11, and an annular ammonia gas distribution pipe 10, and the annular ammonia gas distribution pipe is connected to the throat 9 of the Venturi tube through the ammonia gas nozzles. The diameter D of the mother liquid circulation pipeline is 20cm, the diameter of the inlet section of the Venturi tube is 20cm, and the length of the inlet section is 30cm (1.5D). The diameter of the throat of the Venturi tube is 10cm (d=0.5D), the length of the throat is 10cm; the length of the constricted section is 27cm, and the included angle of the constricted section is 21°. The included angle of the expansion section of the Venturi tube is 8°, and the length...

Embodiment 2

[0019] In another mode of the present invention, the diameter of the annular ammonia gas distribution pipe is 1 cm; the diameter of the ammonia gas inlet pipe is 0.25 cm, and the speed at which the ammonia gas enters the mixing device is adjusted in the range of 1 to 5 m / s; 4 nozzles with a diameter of 1 cm are evenly distributed in the Circumference, connecting the throat of the Venturi tube and the annular ammonia gas distributor, the resistance of the nozzle tube is 10 times the distribution resistance of the circulation tube, which can evenly distribute the ammonia gas to the 4 nozzles. Amide oil was obtained from the caprolactam unit of the Chemical Division of Sinopec Shijiazhuang Refining and Chemical Company. The flow rate of ammonia gas is 0.5~1kg / h.

[0020] In order to test the mixing effect of the Venturi mixer, the free ammonia concentration at the top of causticizing reactor 4 was measured. determined. When the flow rate of ammonia gas is 1.0kg / h, the absorptio...

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Abstract

The invention provides a caprolactam causticization device, which is mainly composed of a causticization reactor, a circulating pump, a venture type gas mixer and a mother liquor circulation pipeline. The venture type gas mixer contains a Venturi tube, 2-16 ammonia nozzles and an annular ammonia distributor pipe, wherein the annular ammonia distributor pipe is connected with the throat of the Venturi tube through the ammonia nozzles. Ammonia is uniformly added into the Venturi tube through an annular ammonia distributor and the ammonia nozzles. By the venture principle, ammonia is rapidly mixed with a mother liquor in the Venturi tube and is absorbed. The direct absorption and mixing effect by the venture type gas mixer is better than the mixing effect by an ammonia-water absorption towerand a static mixer, thus simplifying technological process, minimizing water consumption, reducing investment cost and saving work space.

Description

technical field [0001] The invention belongs to the technical field of refining and separating chemical products, and in particular relates to a device for causticizing treatment of caprolactam products. Background technique [0002] In the process of producing caprolactam by the SNIA method, it is necessary to causticize the amide oil with ammonia water to salinize the acidic by-products in the amide oil and improve its affinity to the water phase so that it can be separated during the extraction process and further processed The refined process obtains qualified caprolactam finished products. Existing causticizing technology as attached to the manual figure 2 As shown, there are five main steps: ① Dissolve ammonia gas in water in the ammonia water absorption tower to form an ammonia solution, and discharge the accumulated escaped ammonia gas through the balance pipe. ② The ammonia solution and the mother liquor are mixed in a static mixer. ③Ammonia absorption heat is ta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J10/00C07D223/10C07D201/16
Inventor 雍玉梅杨超王志侃毛在砂仇振华李向阳姜惠文张广积
Owner CHINA PETROLEUM & CHEM CORP
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