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Novel process for producing calcium nitrite

A technology of calcium nitrite and a new process is applied in the field of industrial production of calcium nitrite to achieve the effects of shortening the process flow, improving the reaction efficiency and improving the reaction speed.

Inactive Publication Date: 2004-01-07
SICHUAN GOLDEN ELEPHANT CHEM IND GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The current method of producing calcium nitrite with low-pressure nitrogen oxide gas is far from meeting the needs of the market. It is necessary to find a new method and related production equipment that can produce calcium nitrite under high-pressure nitrogen oxide gas conditions.

Method used

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  • Novel process for producing calcium nitrite
  • Novel process for producing calcium nitrite
  • Novel process for producing calcium nitrite

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Embodiment Construction

[0012] The process equipment of the present invention comprises a first stage absorption tower 1, a second stage absorption tower 2, a settling tank 11 and a neutralization tower 3, the bottoms of the absorption towers 1 and 2 are respectively separators 12, 13, and the tops are respectively injectors 14, 15, the first-stage absorption tower 1 is connected to the top ejector 15 of the second-stage absorption tower 2 through a pipe 16 on the bottom separator 12, and the second pipe 17 on the separator 12 , is connected to the separator 13 at the bottom of the second-stage absorption tower 2 through the circulation pressure pump 7 and its output pipe 18, a pipe 19 at the bottom of the second-stage absorption tower 2 is connected to the sedimentation tank 11, and the other pipe is the tail gas discharge main pipe 20. There is a pipeline 21 on the top of the neutralization tower 3, which is connected to the supernatant output pipe 22 of the sedimentation tank 11 through the pressur...

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Abstract

A process for preparing calcium nitrite includes absorption reaction of nitrogen oxide and lime slurry in the reactor wherein nitrogen oxide and lime slurry are for warded feed and the followed gas-liquid separation, solid precipitation and neutralization of the Ca(OH)2 remained in the liquid. Specially there is a conditioning stage of NO density by controlling the ratio of NO:NOx before the absorption reaction to supply NO for the need of reaction.

Description

technical field [0001] The present invention relates to a process and equipment for industrial production of calcium nitrite, in particular to a new process and equipment for producing calcium nitrite by using high-pressure nitrogen oxide gas and milk of lime as raw materials. Background technique [0002] Calcium nitrite, the newly discovered optimal cement additive, is in great demand. At present, both at home and abroad, nitric acid oxidized nitrogen gas with a pressure of less than 0.2MPa is used for production. Due to the low pressure, the production equipment is huge, the production efficiency is low, and the product cost is high. Domestic production of nitric acid and nitrogen oxides generally has a pressure of 0.35 to 0.9 MPa. Some manufacturers tried to produce sodium nitrite under the condition of nitrogen oxides of 0.35 MPa, but ended in failure. The current method for producing calcium nitrite with low-pressure nitrogen oxide gas is far from meeting the market ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/50C01F11/36C01F11/38
Inventor 曾纪龙刘朝慧李旭初雷林曾宇峰郭志刚
Owner SICHUAN GOLDEN ELEPHANT CHEM IND GRP CO LTD
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