Method for producing sodium tripolyphosphate by taking mixture of sodium nitrate and ammonium nitrate as catalyst

A technology of sodium tripolyphosphate and ammonium nitrate, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as increasing production costs, and achieve the effects of reducing dosage, transportation and safety management costs

Inactive Publication Date: 2013-12-25
WENGFU (GRP) CO LTD
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Problems solved by technology

However, ammonium nitrate is a dangerous chemical, and corresponding safety precautions m

Method used

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  • Method for producing sodium tripolyphosphate by taking mixture of sodium nitrate and ammonium nitrate as catalyst

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Embodiment

[0016] A factory only used ammonium nitrate as a catalyst to produce sodium tripolyphosphate in April 2011. The monthly output was 2931.17 tons, 8.16 tons of ammonium nitrate was used, the unit price of ammonium nitrate (excluding tax) was 2478.63 yuan / t, and the actual use cost was 8.16÷2931.17× 2478.63=6.90 yuan / t sodium tripolyphosphate; In September 2011, the method of the present invention was adopted, using the mixture of sodium nitrate and ammonium nitrate as a catalyst to produce sodium tripolyphosphate, the monthly output was 2941.5t, and the mixture of sodium nitrate and ammonium nitrate was 8.82t Among them, sodium nitrate is 6.6t, ammonium nitrate is 2.22t, the unit price of sodium nitrate (excluding tax) is 2965.81 yuan / t, and the unit price of ammonium nitrate (excluding tax) is 2478.63 yuan / t. The actual cost of using the mixture of sodium nitrate and ammonium nitrate is (6.6÷ 2941.5×2965.81)+(2.22÷2941.5×2478.63)=8.53 yuan / t sodium tripolyphosphate, and the 6.6t...

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Abstract

The invention discloses a method for producing sodium tripolyphosphate by taking a mixture of sodium nitrate and ammonium nitrate as a catalyst. The method comprises: adding sodium carbonate and wet-method phosphoric acid into a neutralization agitating tank for a neutralization reaction; when the neutralization reaction is finished basically, adding the mixture of sodium nitrate and ammonium nitrate, boiling to prepare a sodium phosphate neutralization liquid, and pumping into a neutralization liquid storage tank; and finally pumping the neutralization liquid into a polymerization furnace via a high-pressure pump, synthesizing sodium tripolyphosphate according to a conventional technology , wherein the mixture of sodium nitrate and ammonium nitrate is taken as the catalyst. By taking the mixture of sodium nitrate and ammonium nitrate as the catalyst of industrial production of sodium tripolyphosphate, the production of sodium tripolyphosphate is accelerated, also sodium tripolyphosphate is changed from I type to II type, and the costs of transportation and safety management of the danger chemical ammonium nitrate are reduced; and by full utilization of Na<+> ions in NaNO3, the use amount of sodium carbonate is reduced, so that the production cost is reduced.

Description

technical field [0001] The present invention relates to phosphate, in particular to sodium tripolyphosphate, especially to 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 belongs to hazardous chemicals, and corresponding safety precautions must be taken during its transportation, storage and use, which...

Claims

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Application Information

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IPC IPC(8): C01B25/41
Inventor 宋锡高程林蒙士元祝勇
Owner WENGFU (GRP) CO LTD
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