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Method for producing hydroxylamine hydrochloride by using industrial tail gas absorption waste liquid

A technology for industrial exhaust gas and hydroxylamine hydrochloride, which is applied in the directions of hydroxylamine, nitrogen and non-metallic compounds, can solve the problems of increased cost, high requirements on the floor space of sewage treatment plants and disadvantages, and achieves the effect of saving costs and reducing industrial water consumption.

Active Publication Date: 2016-01-13
SHANDONG BAOYUAN CHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tail gas produced by this method is generally absorbed by multi-stage water and then emptied through alkali solution absorption, and the tail gas absorption waste liquid is generally discharged directly at low concentrations or discharged up to the standard after complicated and long-term treatment, which will lead to The large increase in water consumption or cost will require a high floor area for sewage treatment plants, and to some extent will cause natural environmental pollution such as water pollution and soil pollution, which is not conducive to the development of environmental friendliness, energy conservation and environmental protection advocated by the society. Therefore, there is an urgent need to recycle the tail gas absorption waste liquid produced during the production of hydroxylamine hydrochloride

Method used

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  • Method for producing hydroxylamine hydrochloride by using industrial tail gas absorption waste liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Take a 4000L reaction tank as an example, and the feeding amount is shown in Table 1.

[0032] Table 1 Feeding amount of Example 1

[0033] Name

Urea

Industrial exhaust gas absorbs waste liquid

Hydrochloric acid

Nitromethane

Feeding amount (Kg)

37.2

3100

310

837

[0034] Table 2 Hydroxylamine Hydrochloride Quality Standard: (HG / T3736-2013)

[0035]

[0036] The quality of hydroxylamine hydrochloride prepared in Example 1 is shown in Table 3.

[0037] Table 3 Quality of Hydroxylamine Hydrochloride

[0038] Item

Embodiment 2

[0040] Take a 4000L reaction tank as an example, the feeding amount is shown in Table 4.

[0041] Table 4 Feeding amount of Example 2

[0042] Name

Urea

Industrial exhaust gas absorbs waste liquid

Hydrochloric acid

Nitromethane

Feeding amount (Kg)

37.8

2700

270

1026

[0043] The quality of hydroxylamine hydrochloride prepared in Example 2 is shown in Table 5.

[0044] Table 5 Hydroxylamine Hydrochloride Quality

[0045] Item

Embodiment 3

[0047] Take a 4000L reaction tank as an example, and the feeding amount is shown in Table 6.

[0048] Table 6 Feeding amount of Example 3

[0049] Name

Urea

Industrial exhaust gas absorbs waste liquid

Hydrochloric acid

Nitromethane

Feeding amount (Kg)

36.4

2800

560

756

[0050] The quality of hydroxylamine hydrochloride obtained in Example 3 is shown in Table 7.

[0051] Table 7 Hydroxylamine Hydrochloride Quality

[0052] Item

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Abstract

The present invention relates to a method for producing hydroxylamine hydrochloride by using industrial tail gas absorption waste liquid, and belongs to the technical field of hydroxylamine hydrochloride production. The method comprises: decolorizing industrial tail gas absorption waste liquid with urea; adding hydrochloric acid and nitromethane to the decolorized industrial tail gas absorption waste liquid, and carrying out a hydrolysis reaction under a heating reflux state; and carrying out concentration and post-treatment on the hydrolyzed liquid so as to obtain the hydroxylamine hydrochloride. According to the present invention, the industrial tail gas absorption waste liquid is completely utilized, the industrial water consumption is reduced, the cost is saved, and advantages of energy saving and environmental protection are provided.

Description

Technical field [0001] The invention relates to a method for producing hydroxylamine hydrochloride by using industrial tail gas to absorb waste liquid, and belongs to the technical field of hydroxylamine hydrochloride production. Background technique [0002] The current process for producing hydroxylamine hydrochloride is to hydrolyze nitromethane in excess hydrochloric acid, and then concentrate hydroxylamine hydrochloride crystals. The tail gas produced by this method is generally absorbed by multi-stage water and then emptied by lye absorption. The tail gas absorption waste liquid is generally discharged directly at low concentration or discharged after complex and long-term treatment. This will lead to Large increase in water consumption or cost increase, sewage treatment plant requires a high floor area, and to some extent, it will also cause natural environmental pollution such as water pollution and soil pollution, which is not conducive to the environmentally friendly, e...

Claims

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Application Information

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IPC IPC(8): C01B21/14
Inventor 辛宁侠孙庆利武福明赵静
Owner SHANDONG BAOYUAN CHEM
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