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CN-118108184-B - Preparation method of bromine

CN118108184BCN 118108184 BCN118108184 BCN 118108184BCN-118108184-B

Abstract

The invention is applicable to the technical field of inorganic matter preparation methods, and provides a bromine preparation method, which comprises the following steps that firstly, a certain amount of sodium bromide and hydrobromic acid are added into a mother liquor pool and stirred to obtain mother liquor; the method comprises the steps of adding a preset amount of stearic acid and polyvinylpyrrolidone, preheating, entering an absorption tower from a preheater, flowing liquid at the bottom of the absorption tower into the upper part of a bromine steaming tower, heating by steam in the bromine steaming tower, introducing water vapor and chlorine gas from the bottom of the bromine steaming tower, introducing bromine steam into the absorption tower, flowing distilled acid liquid generated by the bromine steaming tower into the preheater for preheating, flowing bromine steam out of the upper part of the bromine steaming tower to obtain a mixture of bromine and water, and flowing the mixture of bromine and water into a bromine-water separation bottle for separation to obtain a bromine product.

Inventors

  • LIU WEI

Assignees

  • 潍坊东元连海环保科技有限公司

Dates

Publication Date
20260508
Application Date
20240315

Claims (8)

  1. 1. The preparation method of bromine is characterized by comprising the following steps: adding deionized water into a mother liquor pond, then adding a certain amount of sodium bromide and hydrobromic acid, and stirring to obtain mother liquor; Adding a predetermined amount of stearic acid and polyvinylpyrrolidone into a mother liquor pond, wherein the mass percentage of polyvinylpyrrolidone in the mother liquor is 1-10%; step three, flowing the mother liquor in the mother liquor pool to a preheater for preheating, and then entering an absorption tower from the preheater; The liquid at the bottom of the absorption tower flows into the upper part of the bromine steaming tower and is heated by steam in the bromine steaming tower, water vapor and chlorine gas are introduced from the bottom of the bromine steaming tower, and bromine steam generated by the bromine steaming tower enters the absorption tower; step five, distilled acid liquid generated by the bromine steaming tower flows into a preheater from the bottom of the bromine steaming tower to be preheated, is cooled by a cooler and is neutralized with sodium bicarbonate solution; step six, the mixture of bromine and water flows into a bromine-water separation bottle for separation to obtain a bromine product; in the first step, sodium bromide powder accounts for 30 percent of the mass of deionized water, and hydrobromic acid solution with 60 percent concentration accounts for 10 percent of the mass of the deionized water; and in the second step, the mass percentage of stearic acid in the mother solution is 1-10%.
  2. 2. The method for preparing bromine according to claim 1 wherein in the step one, the stirring time of sodium bromide is 30 minutes, and hydrobromic acid is added and stirred for 30 minutes.
  3. 3. The method for preparing bromine according to claim 1 wherein the preheating temperature in the third step is 50 ℃ to 70 ℃.
  4. 4. The method for producing bromine according to claim 1 wherein a temperature at a top of the bromine distillation column in the fourth step is 85 ℃.
  5. 5. The method for preparing bromine according to claim 1 wherein the ratio of chlorine in the fourth step to the sum of sodium bromide and hydrobromic acid in the first step is 1:2.
  6. 6. The method for preparing bromine according to claim 1 wherein the concentration of sodium bicarbonate solution in the fifth step is 30%.
  7. 7. The method for preparing bromine according to claim 1 wherein the bromine water separating bottle in the sixth step has a pressure of 0.15MPa.
  8. 8. The method for preparing bromine according to claim 1 wherein the temperature in the sixth step is maintained at 30 ℃.

Description

Preparation method of bromine Technical Field The invention is applicable to the technical field of inorganic matter preparation methods and provides a preparation method of bromine. Background Bromine is one of important chemical raw materials, is a main branch of the marine chemical industry, and a wide variety of inorganic bromides, bromates and bromine-containing organic compounds derived from the bromine are of special value in national economy and technological development. Bromine is an important chemical raw material and has wide application in the industries of flame retardants, fire extinguishing agents, refrigerants, photosensitive materials, medicines, pesticides, oil fields and the like. Bromine is mainly used for preparing bromide, as common analysis reagent, oxidant, absorbent for ethylene and heavy hydrocarbon and brominating agent for organic synthesis. In the existing bromine preparation process, bromide is not uniform in the reaction process, so that the subsequent yield is affected, and chlorine is introduced into hydrobromic acid solution to replace bromine in the conventional means, but a large amount of hydrochloric acid is generated, so that the difficulty of water treatment is increased, and the use is inconvenient. Disclosure of Invention In view of the above drawbacks, the present invention provides a method for preparing bromine, which aims to solve the background problem, and includes the following steps: adding deionized water into a mother liquor pond, then adding a certain amount of sodium bromide and hydrobromic acid, and stirring to obtain mother liquor; Adding a predetermined amount of stearic acid and polyvinylpyrrolidone into a mother liquor pond, wherein the mass percentage of polyvinylpyrrolidone in the mother liquor is 1-10%; step three, flowing the mother liquor in the mother liquor pool to a preheater for preheating, and then entering an absorption tower from the preheater; The liquid at the bottom of the absorption tower flows into the upper part of the bromine steaming tower and is heated by steam in the bromine steaming tower, water vapor and chlorine gas are introduced from the bottom of the bromine steaming tower, and bromine steam generated by the bromine steaming tower enters the absorption tower; step five, distilled acid liquid generated by the bromine steaming tower flows into a preheater from the bottom of the bromine steaming tower to be preheated, is cooled by a cooler and is neutralized with sodium bicarbonate solution; And step six, enabling the mixture of bromine and water to flow into a bromine-water separation bottle for separation, and obtaining a bromine product. Further, in the first step, the sodium bromide powder accounts for 30% of the deionized water in mass percent, and the hydrobromic acid solution with the concentration of 60% accounts for 10% of the deionized water in mass percent. Further, the sodium bromide in the first step is stirred for 30 minutes, and hydrobromic acid is added and stirred for 30 minutes. Further, in the second step, the mass percentage of stearic acid in the mother solution is 1-10%. Further, the preheating temperature in the third step is 50-70 ℃. Further, the temperature of the top of the bromine steaming tower in the fourth step is 85 ℃. Further, the ratio of chlorine in the fourth step to the sum of the mass of sodium bromide and hydrobromic acid in the first step is 1:2. Further, the concentration of sodium bicarbonate solution in the fifth step is 30%. Further, the pressure of the bromine water separating bottle in the step six is 0.15MPa. Further, the temperature in the sixth step is maintained at 30 ℃. Advantageous effects The bromine source is hydrogen bromide and sodium bromide, and in the bromine preparation process, the polyvinylpyrrolidone can effectively reduce the surface tension, promote the emulsification of bromine and other substances, and lead the reaction to be more uniform. In addition, the stearic acid can also stabilize the generated bromide, prevent the bromide from precipitating or layering, keep the system stable, promote the chemical reaction in the preheating process, improve the bromine yield, neutralize the distilled acid liquid generated in the bromine steaming tower with sodium bicarbonate solution after preheating the mother solution, generate no waste and fully utilize the distilled acid liquid, maintain the pressure of a condenser in a certain range, realize the full condensation of bromine steam, and realize the separation of bromine and bromine water at a certain pressure and temperature of a bromine water separating bottle. Drawings Fig. 1 is a schematic diagram of the present invention. Detailed Description The present invention will be described in further detail with reference to the accompanying drawings, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described h