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草酸的五种工业生产方法

发布来源:http://www.jinhao360.com    更新时间:2022-08-04 点击数:

草酸的运用广泛,那么草酸的工业生产方法有哪些?其实在工业化生产办法上主要有:甲酸钠法、氧化法、羰基合成法、乙二醇氧化法、丙烯氧化法、一氧化碳偶联法。下面就让氢氧化钾厂家为您详细解答吧。
Oxalic acid is widely used. What are the industrial production methods of oxalic acid? In fact, industrial production methods mainly include: sodium formate method, oxidation method, carbonyl synthesis method, ethylene glycol oxidation method, propylene oxidation method, carbon monoxide coupling method. Now let the potassium hydroxide manufacturer give you a detailed answer.
它一般是无色透明结晶,对人体有害,会使人体内的酸碱度失去平衡,影响儿童的发育,草酸在工业中有重要作用,草酸可以除锈。草酸遍布于自然界,常以草酸盐形式存在于植物如伏牛花、羊蹄草、酢浆草和酸模草的细胞膜,几乎所有的植物都含有草酸盐。
It is generally colorless and transparent crystal, which is harmful to human body. It will cause the pH in human body to lose balance and affect the development of children. Oxalic acid plays an important role in industry, and oxalic acid can remove rust. Oxalic acid is widely distributed in nature and often exists in the cell membrane of plants such as cowhide, Leymus chinensis, Oxalis and Rumex in the form of oxalate. Almost all plants contain oxalate.
1.甲酸钠法:一氧化碳净化后在加压状况下与氢氧化钠反响,生成甲酸钠,然后经高温脱氢生成草酸钠,草酸钠再经铅化(或钙化)、酸化、结晶和脱水枯燥等工序,得到废品草酸。一氧化碳与氢氧化钠合成压力普通为1.8-2.0MPa。脱氢温度为400℃。
1. Sodium formate method: after purification of carbon monoxide, it reacts with sodium hydroxide under pressure to generate sodium formate, and then dehydrogenated at high temperature to generate sodium oxalate, which is then lead (or calcified), acidified, crystallized and dehydrated to obtain waste oxalic acid. The synthetic pressure of carbon monoxide and sodium hydroxide is generally 1.8-2.0mpa. Dehydrogenation temperature is 400 ℃.
氢氧化钾
2.氧化法:以淀粉或葡萄糖母液为原料,在矾触媒存在下,与硝酸-硫酸停止氧化反响得草酸。废气中的氧化氮送吸收塔回收生成稀硝酸。
2. Oxidation method: take starch or glucose mother liquor as raw material, in the presence of alum catalyst, stop oxidation reaction with nitric acid sulfuric acid to obtain oxalic acid. The nitrogen oxide in the waste gas is sent to the absorption tower for recovery to generate dilute nitric acid.
3.羰基合成法:一氧化碳经提纯到90%以上,在钯催化剂存在下与丁醇发作羰基化反响,生成草酸二丁酯,然后经过水解得到草酸,此法分为液相法和气相法两种,气相法反响条件较低,反响压力为300-400kPa。而液相法反响压力为13.0-15.0MPa。
3. Carbonyl synthesis method: carbon monoxide is purified to more than 90% and reacts with butanol in the presence of palladium catalyst to produce dibutyl oxalate, which is then hydrolyzed to oxalic acid. This method is divided into liquid-phase method and gas-phase method. The reaction condition of gas-phase method is low, and the reaction pressure is 300-400kpa. The reaction pressure of liquid phase method is 13.0-15.0mpa.
4.乙二醇氧化法:以乙二醇为原料,在硝酸和硫酸存在下,用空气氧化而得。
4. Ethylene glycol oxidation method: ethylene glycol is obtained by air oxidation in the presence of nitric acid and sulfuric acid.
5.丙烯氧化法:氧化过程分两步停止。步用硝酸氧化,使丙烯转化为α-硝基乳酸;然后进一步催化氧化得到草酸。二步也可采用混酸为氧化剂。丙烯氧化法消费工业级草酸二水化合物,以丙烯计总收率大于90%。
5. Propylene oxidation method: the oxidation process is stopped in two steps. In this step, nitric acid is used for oxidation to convert propylene into α- Nitrolactic acid; Then, oxalic acid is obtained by further catalytic oxidation. Mixed acid can also be used as oxidant in the second step. Industrial grade oxalic acid dihydrate is consumed by propylene oxidation method, and the total yield is more than 90% based on propylene.
因为草酸在人体内不容易被氧化分解掉,经代谢作用后形成的产物,属于酸性物质,可导致人体内酸碱度失去平衡,吃得过多还会中毒。所以说您不得不接触的草酸时要做好安全防护准备。更多咨询就来我们网站http://www.jinhao360.com看看吧。
Because oxalic acid is not easy to be oxidized and decomposed in the human body, the product formed after metabolism belongs to acidic substances, which can lead to the imbalance of pH in the human body and poisoning if you eat too much. Therefore, you should be prepared for safety protection when you have to contact oxalic acid. Come to our website for more information http://www.jinhao360.com Take a look.

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