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Method for producing sodium triphosphate by dry wet combination method

A technology of sodium tripolyphosphate and comprehensive method, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., and can solve the problems of high consumption of phosphoric acid raw materials, not very obvious results, and reduced production costs

Inactive Publication Date: 2005-03-23
四川省犍为明丰化工有限公司
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  • Abstract
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  • Application Information

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Problems solved by technology

Its biggest feature is to use sodium chloride to partially replace sodium carbonate raw materials. Although this production method can reduce the consumption of sodium carbonate raw materials, it has a certain effect on reducing the production cost of sodium tripolyphosphate. However, because it only Partial replacement of sodium carbonate raw material with sodium chloride can only reduce the consumption of sodium carbonate raw material in a small amount, while the consumption of phosphoric acid raw material is still high. Obviously, this production method is in the raw material structure The effects of adjusting, reducing production costs and increasing economic benefits are not very obvious, and when using this method to produce sodium tripolyphosphate, a large amount of hydrogen chloride harmful gas will escape, causing serious environmental pollution problems. It's really worth the candle

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  • Method for producing sodium triphosphate by dry wet combination method

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Embodiment 1

[0037] The method that the present invention proposes produces sodium tripolyphosphate with dry-wet comprehensive method, it carries out by the step of following order successively:

[0038] ①Preparation of rich P by wet method 2 o 5 Phosphoric acid extract:

[0039] (1) Measuring ingredients (by weight):

[0040] Phosphoric acid (H 3 PO 4 Content 85%) 1 part,

[0041] Phosphate rock powder 1 part,

[0042] Glauber's salt 0.5 part,

[0043] (2) wet extraction: phosphoric acid (H 3 PO 4 content 85%) into the extraction reaction tank, after diluting with water to twice the weight of phosphoric acid, then weigh the phosphate rock powder according to the specified weight ratio and add it to the extraction reaction tank, under the condition of uniform stirring, pass in steam to heat, The temperature of the extraction reaction is controlled to be 90°C and the time is 6 hours, and the following extraction reaction is carried out in the extraction reaction tank to...

Embodiment 2

[0067] The method that the present invention proposes produces sodium tripolyphosphate with dry-wet comprehensive method, it carries out by the step of following order successively:

[0068] ①Preparation of rich P by wet method 2 o 5 phosphoric acid extract

[0069] (1) Measuring ingredients (by weight):

[0070] Phosphoric acid (H 3 PO 4 Content 85%) 1 part,

[0071] Phosphate rock powder 3 parts,

[0072] Glauber's salt 1 part,

[0073] (2) wet extraction: first phosphoric acid (H 3 PO 4 content of 85%) into the extraction reaction pool, after diluting with water to 4 times the weight of phosphoric acid, then weigh phosphate rock powder according to the specified weight ratio and add it to the extraction reaction pool. The temperature of the extraction reaction is controlled to be 65°C and the time is 4 hours, and the following extraction reaction is carried out in the extraction reaction tank to generate Ca(H 2 PO 4 ) 2 , and its reaction formula ...

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Abstract

A process for preparing the sodium tripolyphophate by dry-wet integrated method includes wet extracting and dry calcining. It features that the less phosphoric acid and sodium carbonate are respectively used to react on phosphorus ore powder and nitrium sulfate to obtain the extracting liquid rich in P2O5 and the immersing liquid, resulting in very low cost.

Description

Technical field: [0001] The invention relates to a method for producing sodium tripolyphosphate and phosphate products thereof, belonging to the technical field of chemical industry, in particular to a method for producing sodium tripolyphosphate by a dry-wet comprehensive method. Background technique: [0002] Sodium tripolyphosphate and its phosphate products are important products in the chemical industry and an important chemical additive. It is mainly used in many production technology fields such as detergent, petrochemical, pharmaceutical and food industries. For a long time, the production of sodium tripolyphosphate and other phosphate products in the chemical industry has always been the method of neutralizing phosphoric acid with caustic soda or soda ash and then polymerizing. U.S. Patent US 3322493 just discloses a kind of production technology that generates sodium tripolyphosphate product, and it is to react with the aqueous solution of phosphoric acid and basic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/30C01B25/39
Inventor 周成明张志强
Owner 四川省犍为明丰化工有限公司
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