SU138610A1 - - Google Patents

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Publication number
SU138610A1
SU138610A1 SU681297A SU681297A SU138610A1 SU 138610 A1 SU138610 A1 SU 138610A1 SU 681297 A SU681297 A SU 681297A SU 681297 A SU681297 A SU 681297A SU 138610 A1 SU138610 A1 SU 138610A1
Authority
SU
USSR - Soviet Union
Prior art keywords
thiourea
dioxide
product
oxidizing
interaction
Prior art date
Application number
SU681297A
Other languages
Russian (ru)
Publication of SU138610A1 publication Critical patent/SU138610A1/ru

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Description

Двуокись тиомочевины, обладающа  восстанавливающими свойствами , представл ет промышленный интерес, в частности дл  обеспечени  нужд .nponsBOACTiBa искусственного волокна «нитрон.Thiourea dioxide, which has reducing properties, is of industrial interest, in particular, for the maintenance of the .nponsBOACTiBa artificial fiber "Nitron."

Известны различные способы получени  двуокиси тиомочевины, например окислением тиомочевины ЗОо/о-ной перекисью водорода при пониженных температурах с выходом целевого продукта в количестве 440/0 или окислением тиомочевины перекисью водорода в среде хлористого углерода или другого инертного растворител . Однако все известные способы характеризуютс  сложностью оформлени  технологического процесса и недостаточно высоким качеством получаемого продукта .Various methods are known for producing thiourea dioxide, for example, by oxidizing thiourea with ZOO / o-hydrogen peroxide at lower temperatures to yield the desired product in an amount of 440/0 or by oxidizing thiourea with hydrogen peroxide in a medium of carbon chloride or another inert solvent. However, all known methods are characterized by the complexity of the design process and the insufficiently high quality of the product.

Предложенный способ получени  двуокиси тиомочевины заключаетс  во взаимодействии реакционного раствора, получаемого в результате реакции между цианамидом кальци  и гидросульфидом (после отделени  от него гидроокиси кальци ). При взаимодействии указанных компонентов непрерывным отдел етс  продукционна  двуокись тиомочевины с ее последующей фильтрацией, промывкой и сущкой при температуре не выше 60° С. Используемый исходный раствор ввод т в реактор при содержании в нем тиомочевины не менее 80 г/л. Это увеличивает выход и улучшает качество продукта.The proposed method for the preparation of thiourea dioxide consists in the interaction of the reaction solution resulting from the reaction between calcium cyanamide and hydrosulfide (after separation of calcium hydroxide from it). During the interaction of these components, thiourea production dioxide is continuously separated with its subsequent filtration, washing and essence at a temperature not higher than 60 ° C. The initial solution used is introduced into the reactor with a content of thiourea in it not less than 80 g / l. This increases the yield and improves the quality of the product.

Кроме того, маточный раствор после выделени  из него двуокиси тиомочевины используют дл  приготовлени  исходного раствора, что позвол ет устранить загр знение сточмых вод.In addition, the mother liquor, after precipitating thiourea dioxide from it, is used to prepare the stock solution, which eliminates the pollution of the wastewater.

SU681297A SU138610A1 (en)

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