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CN-121990536-A - Production process of granular moisture-resistant dipotassium hydrogen phosphate

CN121990536ACN 121990536 ACN121990536 ACN 121990536ACN-121990536-A

Abstract

The invention relates to a production process of granular moisture-resistant dipotassium hydrogen phosphate, which comprises the following steps of neutralization, one-step drying in a polymerization furnace, cooling and screening. Mixing phosphoric acid, water and alkali, heating to obtain neutralized slurry of dipotassium hydrogen phosphate, controlling pH to 8.8-8.9 and specific gravity to 1.5-1.6g/ml, conveying the neutralized slurry to a polymerization furnace with flow rate of 2.0-2.5 m < 3 >/h, high-pressure pump with pressure of 4.5-5.5MPa, furnace end temperature of 150-170 ℃, polymerization furnace tail temperature of 125-135 ℃, heating in the polymerization furnace for 25-35 min ℃, discharging, cooling and sieving to obtain granular moisture-resistant dipotassium hydrogen phosphate product. The invention can make the content and moisture of the dipotassium hydrogen phosphate reach the standard, form specific uniform small particles, improve the density of the product and reduce the moisture absorption of the moisture-absorbing dipotassium hydrogen phosphate. The method has simple process, can continuously produce and improve the yield, greatly reduces the load of the dust remover cloth bag, and is more efficient and environment-friendly.

Inventors

  • QU MANYI
  • ZHANG YAJUAN
  • WANG DAPENG
  • TAN XIAOLONG
  • FANG HAIWEI

Assignees

  • 湖北省兴发磷化工研究院有限公司

Dates

Publication Date
20260508
Application Date
20260407

Claims (8)

  1. 1. The production process of the granular moisture-resistant dipotassium hydrogen phosphate is characterized by comprising the following steps of: S1, neutralization, namely mixing phosphoric acid, water and alkali, heating to perform neutralization reaction to obtain dipotassium hydrogen phosphate slurry, and adding sodium percarbonate or hydrogen peroxide into the slurry after the neutralization reaction to obtain dipotassium hydrogen phosphate slurry, wherein the addition amount of the sodium percarbonate or hydrogen peroxide is 1.5-2% of the mass of the dipotassium hydrogen phosphate slurry; s2, one-step drying in a polymerization furnace, namely pumping dipotassium hydrogen phosphate feed liquid into the polymerization furnace through a pump, carrying out combustion drying in the one-step polymerization furnace, conveying feed by adopting a high-pressure pump, wherein the flow rate of slurry is 2.0-2.5 m 3 /h, and the pressure of the high-pressure pump is 4.5-5.5MPa; S3, cooling, sieving and packaging, namely cooling the tail material flow of the polymerization furnace, sieving and packaging, and completing the production of the granular moisture-resistant dipotassium hydrogen phosphate.
  2. 2. The process for producing granular moisture-resistant dipotassium hydrogen phosphate according to claim 1, wherein in the step S1, the alkali is potassium carbonate and/or potassium hydroxide, the food phosphoric acid, water and alkali are mixed, steam is introduced, heating and heat preservation are carried out, and the neutralization reaction temperature is 90-105 ℃.
  3. 3. The process for producing granular moisture-resistant dipotassium hydrogen phosphate according to claim 1, wherein in the step S1, the neutralization reaction is finished by adjusting the pH value of the slurry to 8.8-8.9 and the specific gravity to 1.5-1.6g/mL.
  4. 4. The process for producing granular moisture-resistant dipotassium hydrogen phosphate according to claim 1, wherein in the step S2, The feeding device of the polymerization furnace end is provided with a slurry spray gun (1) and a gas gun (2), and the output end of the slurry spray gun (1) is provided with an atomizer (3).
  5. 5. The process for producing granular moisture-resistant dipotassium hydrogen phosphate according to claim 4, wherein in the step S2, the distance between the atomizer (3) and the position of the combustion flame outside the polymerization furnace is 30-35cm.
  6. 6. The process for producing granular moisture-resistant dipotassium hydrogen phosphate according to claim 1, wherein in the step S2, the temperature of the polymerization furnace end is 150-170 ℃, the temperature of the polymerization furnace tail is 125-135 ℃, the heating time of the polymerization furnace is 25-35min, and the outside of the polymerization furnace end is coated with heat-insulating cotton material.
  7. 7. The process for producing granular moisture-resistant dipotassium hydrogen phosphate according to claim 1, wherein sodium percarbonate or hydrogen peroxide is added into dipotassium hydrogen phosphate slurry in a stirring manner, the stirring speed is 100-200r/min, the stirring time is 5-10min, and the mixture is kept warm and stands for 3-5min after stirring.
  8. 8. The process for producing granular moisture-resistant dipotassium hydrogen phosphate according to any one of claims 1 to 7, wherein the main content of the granular moisture-resistant dipotassium hydrogen phosphate obtained by the method is more than or equal to 98%, the pH value of the product is 9.0 to 9.2, the granular moisture-resistant dipotassium hydrogen phosphate is granular, the appearance is granular, the standard sieve is 20 meshes and passes through, the 40 meshes of the sieve is more than or equal to 30%, the 60 meshes of the sieve is more than or equal to 50%, the 100 meshes of the sieve is more than or equal to 75%, and the density is more than or equal to 0.4g/mL.

Description

Production process of granular moisture-resistant dipotassium hydrogen phosphate Technical Field The invention belongs to the technical field of phosphorus compound related dipotassium hydrogen phosphate, and in particular relates to a production process of granular moisture-absorption-resistant dipotassium hydrogen phosphate. Background Dipotassium hydrogen phosphate is a common food additive, is used as a water-retaining agent, a leavening agent, an acidity regulator and a dairy product modifier in the food industry, is used for regulating acidity in coffee partners, enhancing sweet taste and stabilizing foam, and can also be used as a bacterial culture medium and the like. Dipotassium hydrogen phosphate is usually a powdery product, is extremely easy to absorb moisture and dissolve, causes caking and stickiness of the product in the effective period, and brings inconvenience to customers. Development of an anhydrous dipotassium hydrogen phosphate product with low moisture absorption can meet the general demands of the market. The method for producing anhydrous dipotassium hydrogen phosphate in the industry is mainly a spray drying method. The spraying method can continuously produce, and has the problems that firstly, the product powder obtained by spraying is light and thin, wherein about 25-30% of the fine powder is pumped away by a bag-type dust remover to affect the yield, the pumped potassium salt is stuck on a bag of the dust remover to seriously corrode the bag, the service life of the bag is short, and secondly, the fine powder product is extremely easy to absorb moisture and agglomerate. Disclosure of Invention Aiming at the technical problems, the invention provides a production process of granular moisture-resistant dipotassium hydrogen phosphate. The granular anhydrous dipotassium hydrogen phosphate is produced by adopting a one-step heating method of a polymerization furnace, the pH value and the specific gravity of the neutralization reaction are precisely controlled to obtain slurry, and the slurry is input into the polymerization furnace through a high-pressure pump to be directly burnt, heated and dried. The feeding flow, pressure, discharge aperture, position of discharge port and combustion flame, heating temperature, time and the like are regulated through a specific feeding system, so that the dipotassium hydrogen phosphate slurry is fully heated, water can be completely removed, and polymerization reaction is not initiated to generate potassium pyrophosphate. The anhydrous dipotassium hydrogen phosphate obtained by the process is granular, and the moisture absorption of the product is greatly reduced. Compared with a crystallization method, the process is simpler, convenient and continuous in production, can improve the yield, reduce the load of a bag-type dust collector, protect a bag, and is more energy-saving and environment-friendly. The technical scheme of the invention is as follows: A production process of granular moisture-resistant dipotassium hydrogen phosphate comprises the following steps: S1, neutralization, namely mixing phosphoric acid, water and alkali, and heating to perform neutralization reaction to obtain dipotassium hydrogen phosphate slurry; s2, drying the polymerization furnace in one step, namely pumping dipotassium hydrogen phosphate feed liquid into the polymerization furnace through a pump, and burning and drying the dipotassium hydrogen phosphate feed liquid through the one-step polymerization furnace; S3, cooling, sieving and packaging, namely cooling the tail material flow of the polymerization furnace, sieving and packaging, and completing the production of the granular moisture-resistant dipotassium hydrogen phosphate. Preferably, in the step S1, the alkali is potassium carbonate and/or potassium hydroxide, the food phosphoric acid, water and alkali are mixed, and the mixture is heated by steam for heat preservation, and the neutralization reaction temperature is 90-105 ℃. Preferably, in the step S1, the neutralization reaction is finished by adjusting the pH value of the slurry to 8.8-8.9 and the specific gravity to 1.5-1.6g/mL. Preferably, in the step S2, the high-pressure pump conveys the feed, the slurry flow is 2.0-2.5 m 3/h, and the high-pressure pump pressure is 4.5-5.5MPa. Preferably, in the step S2, the feeding device of the polymerization furnace end is provided with a slurry spray gun and a gas gun, and an output end of the slurry spray gun is provided with an atomizer. The slurry spraying gun and the gas gun are arranged, and an atomizer is arranged at the output end of the slurry spraying gun. Preferably, the atomizer is located 30-35cm from the location of the outer flame of the polymerization furnace. Preferably, in the step S2, the temperature of the polymerization furnace end is 150-170 ℃, the temperature of the polymerization furnace tail is 125-135 ℃, and the heating time of the polymerization furnace is 25-35min. Further preferably