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高品质片状氢氧化钾-氯化物含量的测定

发布来源:    更新时间:2022-06-03 点击数:

本标准规定了高品质片状氢氧化钾的分型、要求、试验方法、检验规则、标志、标签、包装、运输、贮存和安全。
This standard specifies the classification, requirements, test methods, inspection rules, marks, labels, packaging, transportation, storage and safety of high-quality flake potassium hydroxide.
本标准适用于精制KCl经离子膜法电解所得的高品质片状氢氧化钾。该产品主要用于电池行业、洗涤剂和化妆品、歧化松香钾皂和各种钾盐、医药中间体、合成橡胶、ABS树脂和天然橡胶乳液、发酵、纸张分量剂、农药制造等。
This standard is applicable to high-quality flake potassium hydroxide obtained from refined KCl by ion-exchange membrane electrolysis. The product is mainly used in battery industry, detergent and cosmetics, disproportionated rosin potassium soap and various potassium salts, pharmaceutical intermediates, synthetic rubber, ABS resin and natural rubber lotion, fermentation, paper dosage agent, pesticide manufacturing, etc.
分子式和相对分子质量
Molecular formula and relative molecular mass
分子式:KOH
Molecular formula: KOH
高品质片状氢氧化钾分为以下三种类型。
High quality flake potassium hydroxide is divided into the following three types.
Ⅰ型:95%规格,氢氧化钾含量为95%以上的产品。
Type I: products with 95% specification and more than 95% potassium hydroxide content.
Ⅱ型:90%规格,氢氧化钾含量为90%以上、95%以下的产品。
Type II: products with 90% specification and potassium hydroxide content of more than 90% and less than 95%.
Ⅲ型:75%规格,氢氧化钾含量为75%以上、90%以下的产品。
Type III: 75% specification, with potassium hydroxide content of more than 75% and less than 90%.
外观:白色片状。
Appearance: white flake.
试验方法
test method
氯化物含量的测定
Determination of chloride content
电位滴定法(仲裁法)
Potentiometric titration (arbitration method)
方法提要
Method summary
在酸性乙醇-水溶液中,以银-硫化银电极为测量电极,甘汞电极为参比电极,用硝酸银标准滴定溶液滴定,借助于电位突跃确定其反应终点。
In the acid ethanol water solution, the silver silver sulfide electrode was used as the measuring electrode and calomel electrode as the reference electrode. The end point of the reaction was determined by means of potential jump.
氢氧化钾
试剂
reagent
同GB/T3050-2000中的第4章。
The same as Chapter 4 of gb/t3050-2000.
仪器
instrument
同GB/T3050-2000中的第5章。
The same as Chapter 5 of gb/t3050-2000.
分析步骤
Analysis steps
移取10mL试验溶液A置于50mL烧杯中,加1滴溴酚蓝指示液,用氢氧化钠溶液或硝酸溶液调节溶液的pH值,使溶液恰呈黄色。加入1mLKCl标准溶液[c(KCl)=0.005mol/L],再加入乙醇,使乙醇与试验溶液的体积比为3:1,总体积不大于40mL,以下按GB/T3050-2000中6.2“以下操作按4.6中……同时进行空白试验”规定进行操作。
Transfer 10ml of test solution a into a 50ml beaker, add 1 drop of bromophenol blue indicator solution, and adjust the pH value of the solution with sodium hydroxide solution or nitric acid solution to make the solution just yellow. Add 1ml of KCl standard solution [c (KCl) =0.005mol/l], and then add ethanol, so that the volume ratio of ethanol to test solution is 3:1, and the total volume is no more than 40ml. The following operations shall be carried out according to the provisions of 6.2 "blank test shall be carried out at the same time in 4.6" in gb/t3050-2000.
GB/T3050-2000无机化工产品中氯化物含量测定的通用方法电位滴定法
Gb/t3050-2000 inorganic chemical products - General method for determination of chloride content - Potentiometric Titration
结果计算
Result calculation
氯化物含量以氯(Cl)的质量分数ω3计,数值以%表示,按式(4)计算:
Chloride content is determined by the mass fraction of chlorine (CL) ω 3. The value is expressed in% and calculated according to formula (4):
式中:
Where:
V一一试验溶液消能硝酸银标准滴定溶液的体积的数值,单位为毫升(mL);
V -- volume of silver nitrate standard titration solution for energy dissipation of test solution, unit: ml;
V0一一空白试验溶液消耗硝酸银标准滴定洛液的体积的数值,单位为毫升(mL);
V0 -- volume of silver nitrate standard titration solution consumed by blank test solution, unit: ml;
c一一硝酸银标准滴定溶液的浓度的准确数值,单位为摩尔每升(mol/L);
C -- accurate concentration of silver nitrate standard titration solution, unit: mol/l;
m一一试料质量的数值,单位为克(g);
M -- value of sample mass, in grams (g);
M一一氯(Cl)的摩尔质量的数值,单位为克每摩尔(g/moL)(M=35.45)。
M -- the value of the molar mass of chlorine (CL), in grams per mole (g/mol) (m=35.45).
取平行测定结果的算术平均值为测定结果,两次平行测定结果的差值为不大于0.0005%。
Take the arithmetic mean of the parallel determination results as the determination results, and the difference between the two parallel determination results shall not be greater than 0.0005%.
高品质片状氢氧化钾-氯化物含量的测定的过程内容便是如此了,您可以作为参考使用,当然在实验过程中安全是要做好保障的,更多内容就来关注我们网站www.jinhao360.com吧!
This is the content of the process of determining the content of high-quality flake potassium hydroxide chloride. You can use it as a reference. Of course, safety should be guaranteed during the experiment. For more information, please pay attention to our website www.jinhao360 Com!

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