阅读说明：本技术 一种溴化钠溶液中清除溴酸盐的方法 (Method for removing bromate from sodium bromide solution ) 是由 徐善泉 储宇锋 季敏 周雪华 于 2021-10-08 设计创作，主要内容包括：本发明公开了一种溴化钠溶液中清除溴酸盐的方法,包括如下步骤：1)将需处理的溴化钠溶液取样检测溴酸钠含量,并将溶液直接送入精制釜内,测定其PH值并用溴氢酸调节；2)根据母液中溴酸盐的重量百分浓度计算出溴酸盐的重量；3)根据溴酸盐的重量计算需加入尿素的量；4)将计算量的尿素加入反应釜再加入足够的液碱；5)将处理后无溴酸钠的溶液过滤,过滤后泵入蒸发釜,常压蒸发提浓,用离心机内分离,母液返回使用,溴化钠结晶送至烘房烘干,干燥好的物料即为溴化钠。本发明操作方便,不增加设备投资,不增加任何操作程度,不增加能源消耗,成本低；将除BrO-(3)、Br结合起来一步清除,效率高。(The invention discloses a method for removing bromate from a sodium bromide solution, which comprises the following steps: 1) sampling a sodium bromide solution to be treated to detect the content of sodium bromate, directly feeding the solution into a refining kettle, measuring the pH value of the solution and adjusting the pH value by using hydrobromic acid; 2) calculating the weight of bromate according to the weight percentage concentration of the bromate in the mother solution; 3) calculating the amount of urea to be added according to the weight of bromate; 4) adding the calculated amount of urea into a reaction kettle and then adding enough liquid caustic soda; 5) filtering the solution without the sodium bromate, pumping the solution into an evaporation kettle after filtering, evaporating and concentrating at normal pressure, separating by using a centrifuge, returning the mother liquor for use, sending the sodium bromide crystal to a drying room for drying, and obtaining the dried material which is the sodium bromide. The invention has convenient operation, no increase of equipment investment, no increase of any operation degree, no increase of energy consumption and low cost; will remove BrO 3 And Br is combined to be removed in one step, so that the efficiency is high.)

1. A method for removing bromate from a sodium bromide solution is characterized by comprising the following steps: the method comprises the following steps:

1) sampling a sodium bromide solution to be treated to detect the content of sodium bromate, directly feeding the solution into a refining kettle, measuring the pH value of the solution and adjusting the pH value by using hydrobromic acid; 2) Calculating the weight of bromate according to the weight percentage concentration of the bromate in the mother solution;

3) calculating the amount of urea to be added according to the weight of bromate;

4) adding the calculated amount of urea into a reaction kettle and then adding enough liquid caustic soda;

5) filtering the solution without the sodium bromate, pumping the solution into an evaporation kettle after filtering, evaporating and concentrating at normal pressure, separating by using a centrifuge, returning the mother liquor for use, sending the sodium bromide crystal to a drying room for drying, and obtaining the dried material which is the sodium bromide.

2. The method for removing bromate from sodium bromide solution according to claim 1, wherein: 0.5 kg of urea per kg of bromate was added in step 3).

3. The method for removing bromate from sodium bromide solution according to claim 1, wherein: the reaction temperature of the urea in the step 4) is 60-90 ℃.

4. The method for removing bromate from sodium bromide solution according to claim 1, wherein: the weight percentage concentration of the liquid caustic soda in the step 4) is 32%.

5. The method for removing bromate from sodium bromide solution according to claim 4, wherein: in the step 4), 1 kg of liquid alkali is required to be added to each kg of sodium bromate.

6. The method for removing bromate from sodium bromide solution according to claim 1, wherein: the dosage of the urea is 1 percent of the total amount of the sodium bromide solution.

Technical Field

The invention relates to the field of chemical manufacturing, in particular to a method for removing bromate from a sodium bromide solution.

Background

The sodium bromide is used for preparing photosensitive film, and can be used as diuretic and sedative in medicine, and has effect in enhancing cerebral cortex inhibiting process. It is used as brominating agent in synthetic perfume, medicine and dye industry, and also as chemical reagent.

The present method for producing sodium bromide includes dissolving sodium carbonate and urea in hot water, introducing bromine, controlling temperature and reducing bromine to obtain sodium bromide. Then adding active carbon for decoloring, filtering, evaporating and crystallizing to obtain a finished product. And the neutralization method is to neutralize hydrobromic acid and sodium carbonate solution to ensure that the PH value is between 7.5 and 8, centrifugally filter, concentrate and crystallize to obtain a finished product. Bromate is produced during the preparation of sodium bromide from bromine and sodium hydroxide solutions.

In the general process of storing sodium bromide, the sodium bromide is irradiated by sunlight and is acted by oxygen in the air, so that side reaction is also generated to generate bromate, and the existence of the bromate in the sodium bromide liquid or solid can influence the quality of a product, influence the application range of the product and need to be removed. BrO removal from solution_3-Sodium bromide can be generally recrystallized from NaBrO³Separating; h may also be added₂SO₄The former step is complicated and expensive after being heated and removed, and the latter step can only be partially removed and carries in impurity SO₄ ^2-。

Disclosure of Invention

The invention mainly solves the technical problem of providing a method for removing bromate from a sodium bromide solution, which has the advantages of convenient operation, no increase of equipment investment, no increase of any operation degree, no increase of energy consumption and low cost; will remove BrO₃And Br is combined to be removed in one step, so that the efficiency is high.

In order to solve the technical problems, the invention adopts a technical scheme that: a method for removing bromate from a sodium bromide solution is provided, which comprises the following steps:

1) sampling a sodium bromide solution to be treated to detect the content of sodium bromate, directly feeding the solution into a refining kettle, measuring the pH value of the solution and adjusting the pH value by using hydrobromic acid; 2) Calculating the weight of bromate according to the weight percentage concentration of the bromate in the mother solution; 3) Calculating the amount of urea to be added according to the weight of bromate;

4) adding the calculated amount of urea into a reaction kettle and then adding enough liquid caustic soda;

5) filtering the solution without the sodium bromate, pumping the solution into an evaporation kettle after filtering, evaporating and concentrating at normal pressure, separating by using a centrifuge, returning the mother liquor for use, sending the sodium bromide crystal to a drying room for drying, and obtaining the dried material which is the sodium bromide.

In a preferred embodiment of the invention, 0.5 kg of urea per kg of bromate is added in step 3).

In a preferred embodiment of the present invention, the reaction temperature of the urea in the step 4) is 60-90 ℃.

In a preferred embodiment of the present invention, the concentration of the liquid caustic soda in the step 4) is 32% by weight.

In a preferred embodiment of the invention, 1 kg of liquid alkali is added per kg of sodium bromate in the step 4).

In a preferred embodiment of the invention, the urea is used in an amount of 1% of the total amount of the sodium bromide solution.

The invention has the beneficial effects that: the invention has convenient operation, no increase of equipment investment, no increase of any operation degree, no increase of energy consumption and low cost; will remove BrO₃And Br is combined to be removed in one step, so that the efficiency is high.

Detailed Description

The following detailed description of the preferred embodiments of the present invention is provided to enable those skilled in the art to more readily understand the advantages and features of the present invention, and to clearly and unequivocally define the scope of the present invention.

The embodiment of the invention comprises the following steps: a method for removing bromate from a sodium bromide solution comprises the following steps:

1) sampling a sodium bromide solution to be treated to detect the content of sodium bromate, directly feeding the solution into a refining kettle, measuring the pH value of the solution and adjusting the pH value by using hydrobromic acid; 2) Calculating the weight of the bromate according to the weight percentage concentration of the bromate in the mother solution, wherein the weight (kg) = the weight (kg) of the liquid by percentage; 3) Calculating the amount of urea to be added according to the weight of bromate, and adding 0.5 kg of urea into each kg of bromate;

4) adding urea in a calculated amount into a reaction kettle, and adding enough liquid caustic soda with the weight percentage concentration of 32%, wherein the amount of the urea is 1% of the total amount of the sodium bromide solution, the reaction temperature of the urea is 60-90 ℃, and 1 kg of the liquid caustic soda needs to be added into each kg of the sodium bromate;

5) filtering the solution without the sodium bromate, pumping the solution into an evaporation kettle after filtering, evaporating and concentrating at normal pressure, separating by using a centrifuge, returning the mother liquor for use, sending the sodium bromide crystal to a drying room for drying, and obtaining the dried material which is the sodium bromide.

The final product performance parameters are shown in the table below.

The method for removing bromate from the sodium bromide solution is convenient to operate, does not increase equipment investment, does not increase any operation degree, does not increase energy consumption, and is low in cost; will remove BrO₃And Br is combined to be removed in one step, so that the efficiency is high.

4. High economic benefit, and combines BrO3 removal and Br removal without increasing energy consumption.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.