Synthesis method of sulphate

Thioammonium refers to a class of compounds of the general formula ROCSNHR, which can be regarded as a derivative of xanthate (xanthine) (substituted by alkylamine-RNH for the sulfhydryl group in xanthogen ROCSSH), usually an oily liquid It has a special smell and is less soluble in water. As an excellent sulfide ore flotation agent, it has the following characteristics: it has strong ability to capture zinc sulfide ore and copper ion activated sphalerite and gold, and has a good ability to capture some sulfide minerals such as iron sulfide. Weak, thus showing good selectivity in the separation of copper, sulfur, gold and zinc and zinc sulfur, can be used under weak alkaline conditions, reducing the amount of lime, which is conducive to sulfur flotation and sulfur concentrate filtration It is easy to foam and is widely used in the flotation of various copper, gold and lead-zinc mines.

Synthetic method haloalkyl esterification

This method is a conventional method for producing thiourethane, and the specific reaction steps can be expressed by the following reaction formula:

MOH+CS+ROH--ROCSSM+H,o

ROCSSA+CH2C→→ ROCSSCH3+MCl

ROCSSCH3+ R NH--ROCSNHR+CH, SH

In the above reaction formula, M represents an alkali metal, and R and R represent an alkyl group of a carbon atom.

The method for producing thiourethane has an optimum material molar ratio, that is, (CS2: MOH: ROH: CH3Cl: R'NH2) is 1:1.135: 4.0: 1.011.01. From the perspective of saving investment in equipment, the above reaction can be carried out in the same reactor at 35~50 ° C, and the reaction of fatty alcohol, alkali metal hydroxide and carbon disulfide for not less than 30 min, to produce xanthate, which The temperature of a reaction step must be strictly controlled to prevent the formation of by-product trithiocarbonate, and the resulting xanthate is reacted with a chloroalkane at 40-55 ° C for 30 min to form an intermediate alkylxanthate. The chloroalkane used therein is generally monochloromethane instead of a long carbon chain chloroalkane, because if a long carbon chain chloroalkane is used, the by-product mercaptan and product thiourethane formed by the subsequent reaction are used. The separation is difficult, and then the lower alkylamine is introduced at 15~50 °C to react with the intermediate alkylxanthate formed in the previous reaction. The temperature of this reaction step should not be too high, because the reactant lower alkylamine The boiling point is relatively low. After the reaction is completed, the by-product mercaptan is separated from the product to obtain an oily product, but the required thiourethane content in the product is only 50%-90%, and the remaining impurities may be dithioamino groups. Formate, xanthate, trithio Ester. It can be seen that the production of thiourethane by this method requires high requirements for equipment and esterification temperature, side reactions occur, and the product is not easily purified.