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Method for producing sodium tripolyphosphate by replacing ammonium nitrate with sodium nitrate taken as catalyst

A technology of sodium tripolyphosphate and sodium nitrate, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as increasing production costs, and achieve reduction in usage, production costs, transportation and safety management costs. Effect

Inactive Publication Date: 2012-07-18
WENGFU (GRP) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, ammonium nitrate is a hazardous chemical, and corresponding safety precautions must be taken during its transportation, storage and use, which increases production costs.

Method used

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  • Method for producing sodium tripolyphosphate by replacing ammonium nitrate with sodium nitrate taken as catalyst

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Embodiment

[0010] In April 2011, a factory only used ammonium nitrate as a catalyst to assist production. The monthly output was 2931.17 tons, and ammonium nitrate was 8.16 tons. Yuan / ton sodium tripolyphosphate;

[0011] In October 2011, the method of the present invention was adopted, and only sodium nitrate was used as a catalyst to assist production. The monthly output was 2748.675 tons, and 11.3 tons of sodium nitrate was used. 2965.81=12.19 yuan / ton of sodium tripolyphosphate, 11.3 tons of sodium nitrate can reduce the consumption of 11.3×106×98%÷(85×98%)=14.09 tons of soda ash, then the use of sodium nitrate in October can reduce the cost by 14.09÷2748.675 ×1725.05=8.84 yuan / ton of sodium tripolyphosphate, the actual cost of adding sodium nitrate should be: 12.19-8.84=3.35 yuan / ton of sodium tripolyphosphate;

[0012] It can be seen from the above that using sodium nitrate instead of ammonium nitrate as a catalyst for industrial pentasodium production can reduce productio...

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PUM

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Abstract

The invention discloses a method for producing sodium tripolyphosphate by replacing ammonium nitrate with sodium nitrate taken as catalyst. The method comprises the steps as follows: adding soda and wet process phosphoric acid are in a neutralization agitation tank for neutralization reaction, adding sodium nitrate in the product according to the proportion that 4 to 5 kg of sodium nitrate added in one ton of sodium tripolyphosphate after the neutralization reaction is largely over, boiling for 15 to 20 min to produce sodium orthophosphate neutralization liquid, pumping the sodium orthophosphate neutralization liquid into a neutralization liquid storage tank, and finally pumping the neutralization liquid into a polymerization furnace by a high pressure pump to synthesize sodium tripolyphosphate. The pH value of the neutralization reaction is controlled to be 6.5 to 7.0, the Baume density of neutralization slurry is controlled to be 54 to 56 Degree Baum'e, and the relative density is 1.50 to 1.60. After the method provided by the invention is adopted, the cost for transportation and safety management of nitramine (hazardous chemical substance) can be reduced; and when nitramine is replaced by sodium nitrate, Na<+> ion in Na NO3 can be fully utilized, and the consumption of soda can be reduced, so that the manufacturing cost can be lowered.

Description

technical field [0001] The invention relates to a production method of phosphate, in particular to a method of using sodium nitrate instead of ammonium nitrate as a catalyst for the production of sodium tripolyphosphate. Background technique [0002] Sodium tripolyphosphate (Na 5 P 3 o 10 ) There are Type I and Type II, and industrial sodium tripolyphosphate is actually a mixture of Type I and Type II. Type I dissolves quickly, and has a large thermal effect when it is hydrated to form hexahydrate, and it is easy to absorb moisture and agglomerate in the atmosphere. Type II absorbs moisture slowly and is not easy to agglomerate. Adding ammonium nitrate as a catalyst for the production of sodium tripolyphosphate can speed up the production speed of sodium tripolyphosphate, and at the same time convert type I into type II and reduce the content of type I. However, ammonium nitrate is a hazardous chemical, and corresponding safety precautions must be taken during i...

Claims

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Application Information

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IPC IPC(8): C01B25/41
Inventor 宋锡高程林祝勇
Owner WENGFU (GRP) CO LTD
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