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电解氢氧化钾溶液的PH会升高

发布来源:    更新时间:2022-05-23 点击数:

氢氧化钾是一种白色固体物质,属于强碱,腐蚀性强。易溶于水。在空气中易吸收二氧化碳和水分,致使变质。通常用电解氯化钾溶液,或将碳酸钾和石灰乳反应而得。用于制取钾盐和钾肥皂,还可作干燥剂等。
Potassium hydroxide is a white solid substance, belonging to strong alkali and strong corrosivity. Soluble in water. It is easy to absorb carbon dioxide and water in the air, resulting in deterioration. It is usually obtained by electrolyzing potassium chloride solution or reacting potassium carbonate with lime milk. It is used to make potassium salt and potassium soap, and can also be used as desiccant.
电解氢氧化钾溶液,阳极发生反应4OH--4e-=2H?O+O?↑阴极此时发生反应4H++4e-=2H?↑总反应方程式2H?O=电解=2H?↑+O?↑
Electrolytic potassium hydroxide solution, anode reaction 4OH -- 4e - = 2H? O+O? ↑ the cathode reacts at this time 4H + + 4E - = 2H? ↑ total reaction equation 2H? O = electrolysis = 2H? ↑+O? ↑
水减少氢氧化钾浓度增大,pH升高,如果是电解熔融氢氧化钾情况会有所不同。电解熔融氢氧化钾时情况如下:
When the water decreases, the concentration of potassium hydroxide increases and the pH increases. If it is electrolytic melting of potassium hydroxide, the situation will be different. The situation of electrolytic melting of potassium hydroxide is as follows:
阳极:K++e-=K
Anode: K + + e - = k
阴极:4OH--4H+=2H?O(g)+O?↑
Cathode: 4OH -- 4H + = 2H? O(g)+O? ↑
总反应方程式:4KOH(熔融)=电解=4K+2H?O(g)+O?↑
Total reaction equation: 4koh (melting) = electrolysis = 4K + 2H? O(g)+O? ↑
由于氢氧化钾在熔融状态下无H+存在,在熔融状态下温度为300+℃,H?O以气体形式存在,所以不符合水溶液环境。
Since there is no H + in the molten state of potassium hydroxide, the temperature in the molten state is 300 + ℃, H? O exists in the form of gas, so it does not conform to the environment of aqueous solution.
氢氧化钾
氢氧化钾是基础化学工业中的重要产品,主要用作钾盐和钾碱的生产原料,在医药、轻工业、电化工、纺织等领域也有广泛应用。应用举例如下:一种以甲苯作为反应的缓冲剂,用氢氧化钾作催化剂将甲基环硅氧烷在一定温度和压力的条件下进行开环聚合,再用硫酸进行水解中和,然后减压脱去甲苯制得粘度为20~40CS,羟基含量在2~12%以上的小分子羟基硅油。
Potassium hydroxide is an important product in the basic chemical industry. It is mainly used as raw material for the production of potassium salt and potash. It is also widely used in medicine, light industry, electrochemistry, textile and other fields. The application examples are as follows: a small molecular hydroxyl silicone oil with viscosity of 20 ~ 40cs and hydroxyl group content of more than 2 ~ 12% is prepared by ring opening polymerization of methylcyclosiloxane under certain temperature and pressure with toluene as reaction buffer and potassium hydroxide as catalyst, hydrolysis and neutralization with sulfuric acid, and then removing toluene under reduced pressure.
氢氧化钾催化合成小分子羟基硅油的方法采用甲基环硅氧烷为原料,以甲苯作为反应缓冲剂,用氢氧化钾作催化剂,硫酸作中和剂在水中进行开环聚合,原材料的组分质量份配比为:
The method of synthesizing small molecule hydroxyl silicone oil catalyzed by potassium hydroxide uses methylcyclosiloxane as raw material, toluene as reaction buffer, potassium hydroxide as catalyst and sulfuric acid as neutralizer for ring opening polymerization in water. The component mass ratio of raw materials is:
甲基环硅氧烷为100质量份、氢氧化钾10~70质量份、甲苯70~120质量份、硫酸8.5~60质量份;工艺控制条件:反应温度100~150℃、反应时间2~7小时、水解温度30~70℃、水解时间1~3小时、搅拌转速大于70转/分钟。
Methylcyclosiloxane is 100 parts by mass, potassium hydroxide 10 ~ 70 parts by mass, toluene 70 ~ 120 parts by mass and sulfuric acid 8.5 ~ 60 parts by mass; Process control conditions: reaction temperature 100 ~ 150 ℃, reaction time 2 ~ 7 hours, hydrolysis temperature 30 ~ 70 ℃, hydrolysis time 1 ~ 3 hours, stirring speed greater than 70 rpm.
此外要密封保存,避免与空气中的水、二氧化碳反应;储存于阴凉、干燥、通风良好的环境中。远离火种、热源,环境湿度好不大于85%。与易(可)燃物、酸类等分开存放,切忌混储。储区应备有合适的材料收容泄漏物。更多相关信息就来关注网站www.jinhao360.com咨询了解!
In addition, it shall be sealed and stored to avoid reaction with water and carbon dioxide in the air; Store in a cool, dry and well ventilated environment. Keep away from kindling and heat sources, and the ambient humidity shall not be greater than 85%. It shall be stored separately from inflammables and acids, and mixed storage shall not be allowed. The storage area shall be equipped with appropriate materials to contain leakage. For more information, please visit www.jinhao360.com Com consultation!

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