SU427617A1

SU427617A1 - Process for producing viscose fiber

Info

Publication number: SU427617A1
Application number: SU721831789A
Authority: SU
Inventors: А.Т. Серков; Г.А. Будницкий; Б.М. Соколовский; В.К. Лежнев
Original assignee: Serkov A T; Budnitskij G A; Sokolovskij B M; Lezhnev V K
Priority date: 1972-09-27
Filing date: 1972-09-27
Publication date: 1983-05-07

Abstract

СПбСОБ ПОЛУЧЕНИЯ ВИСКОЗНОГОВОЛОКНА путем формовани вискозы идовосстановлени в осадительнойванне, промывки, авиважной обработки и сушки,отличающий- с . тем, что, с целью уменьшени энергетических затрат и локализации выделени вредных газов в процессе сушки, сформованную вискозную нить охлаждают до температуры кипени сероуглерода, а промывку и авиваж- ную обработку провод т при температуре ниже температуры кипени сероуглерода.'FSTSOBB OBTAINING VISKOZNOGOVOGOVOKNA by forming viscose and recovery in precipitation bath, washing, avivazhnogo processing and drying, which differs with. In order to reduce energy costs and localize the release of harmful gases during the drying process, the molded viscose thread is cooled to the boiling point of carbon disulfide, and washing and automatic treatment is carried out at a temperature below the boiling point of carbon disulfide.

Description

Изобретение относится к производству искусственных волокон, в частности вискозных.The invention relates to the production of artificial fibers, in particular viscose.

Известен способ получения вискозного волокна на агрегатах непрерывного процесса, где последовательно осуществляют формование вискозы, довосстановление в осадительной ванне, промывку, авиважную обработку и сушку. Обычно каждая из технологических операций осуществляется с помощью отдельных механизмов. Целью изобретения является сниже- . ние энергетических затрат й локализация выделенных вредных газов в процессе сушки при получении вискозного волокна.A known method of producing viscose fiber on the aggregates of a continuous process, where the formation of viscose, re-restoration in a precipitation bath, washing, washing and drying, are successively carried out. Usually, each of the technological operations is carried out using separate mechanisms. The aim of the invention is to lower. reduction of energy costs and localization of the released harmful gases in the drying process upon receipt of viscose fiber.

Сущность предлагаемого способа состоит в том, что вискозную нить.у сформованную в осадительной ванне, имеющей сравнительно невысокую температуру (не выше 60°С) , охлаждают до температуры кипения сероуглерода и подвергают промывке и авийажной обработке при температуре ниже температуры кипения сероуглерода. Основная часть сероуглерода (до 65% от заданного) остается в виде эмульсии, хотя нить уже отмыта от всех растворимых примесей. Такая нить затем поступает на сушку, которая производится при температуре выше температуры кипения сероуглерода. Во время сушки из нити одновременно с влагой удаляется сероуглерод.The essence of the proposed method lies in the fact that the viscose yarn formed in a precipitation bath having a relatively low temperature (not higher than 60 ° C) is cooled to the boiling point of carbon disulfide and subjected to washing and over-treatment at a temperature below the boiling point of carbon disulfide. The bulk of the carbon disulfide (up to 65% of the target) remains in the form of an emulsion, although the thread has already been washed from all soluble impurities. Such a thread then goes to a dryer, which is produced at a temperature above the boiling point of carbon disulfide. During drying, carbon disulfide is removed from the filament simultaneously with moisture.

Таким образом, новый способ характеризуется совмещением двух технологических операций - сушки и удаления сероуглерода.Thus, the new method is characterized by the combination of two technological operations - drying and removal of carbon disulfide.

Описанный способ имеет ряд преимуществ перед известными, а именно: уменьшаются энергетические затраты, так как отпадает необходимость в обработке нити по выходе ее из осадительной ванны, а два высокотемпературных фазовых процесса сушку и удаление сероуглерода - совмещают в одну операцию и нагрев нити проводят один раз, локализуется выделение вредных газов в двух местах: зоне формования и зоне сушки (во время промывки благодаря осуществлению этой операции при пониженной температуре выделение вредных газов практически не происходит) создаются предпосылки для разработки конструкционно упрощенной высокопроизводительной 55 прядильно-отделочной машины непрерывного процесса, так как исключа-The described method has several advantages over the known ones, namely: energy costs are reduced, since there is no need to process the filament after it leaves the precipitation bath, and two high-temperature phase processes, drying and carbon disulfide removal are combined in one operation and the filament is heated once, the emission of harmful gases is localized in two places: the molding zone and the drying zone (during washing, due to the implementation of this operation at a low temperature, the emission of harmful gases practically does not occur) There are prerequisites for the development of a structurally simplified high-performance 55 spinning and finishing machine of a continuous process, since

Claims

METHOD FOR PRODUCING VISCOSE FIBER by molding viscose and reconditioning in a precipitation bath, washing, tipping and drying, different. the fact that in order to reduce energy costs and localize the emission of harmful gases during the drying process, the formed viscose thread is cooled to the boiling point of carbon disulfide, and washing and pre-treatment are carried out at a temperature below the boiling point of carbon disulfide. ' - distillation of carbon disulfide from the filament, requiring high temperatures.

The proposed method may be

5 carried out. On known machines without change or after some reconstruction.

Example 1. Viscose with a cellulose content of 7.5%, alkali 6.3%, 10 viscosity of 40 s and a maturity of 18 to 0.1 N. NH ^ Cl solution enters the spinning thread 13 tex through a spinneret with 30 holes with a diameter of 0.08 mm The precipitation bath has · (5 composition, g / l: sulfuric acid 145 g / l, zinc sulfate 18 g / l. Specific gravity is 1,260, molding is vertical. The filament path in the bath is 40 cm. The temperature of the precipitation bath is 50 ° C.

Upon leaving the precipitation bath, the thread makes only 3 turns on pre-reducing rollers, which are dipped into the bath at a temperature below the boiling point of carbon disulfide. Next, the thread is subjected to washing and avivazhnoy processing. The temperature of the flushing water is 21 ° C. After avivazhnogo processing, the thread contains 45% of carbon disulphide from that specified during xantogenation. A thread with 30 such a carbon disulfide content is sent for drying, which is carried out by the contact method on steam heated cylinders. The dried thread is taken for packaging.

35 Example 2. In example 1, the method was implemented on the machine PGSh-100-I without its reconstruction. In order to increase economic efficiency, as well as to localize the emitted harmful gases, the PNSh-100-I machine is modernized by replacing the spinning bath and pre-recovery rollers with long spinning tubes, which combine forming and renewal of fibers45. The thread coming out of the spinning tube containing 50% of the carbon disulfide from the one set during xanthogenation is washed with water at 31 ° C, treated with a 50 Rum trivial solution at the same temperature and sent to contact drying. The carbon disulfide content in the filament fed to the dryer is 48% of the target. During drying, carbon disulfide evaporates along with water and the resulting vapor-air mixture enters for regeneration.

Proofreader G. Ogar