Clean Production: Low Temperature Pretreatment To Resolve Printing And Dyeing High Pressure

In order to promote cleaner production in printing and dyeing industry, it is an important way to reduce the temperature of pre-treatment process and reduce the use of chemicals, and it will also be an inevitable choice. The key technology of low temperature pretreatment for textiles, which was jointly completed by Donghua University, China Textile Limited by Share Ltd and Qingdao blue biological Group Co., Ltd., won the first prize in textile science and technology progress in 2013. Printing and dyeing industry Focus on energy conservation and emission reduction.

Details of tackling key problems and finally achieved industrialization results

"The water consumption, energy consumption and CODCr emissions of the fabric pretreatment process account for 55%~60% of the whole process of dyeing and finishing." Mao Zhiping, an adult and Donghua University, said that the cold pad batch pretreatment has been mature and applied by industrialization in the low temperature pretreatment technology of fabrics. Although the process is energy efficient, its use of chemicals and pollutant emissions are significantly higher than those of conventional processes, which is not really a clean production technology.

According to Li Chunguang, executive director of the technical center of China Textile Limited by Share Ltd, the use of organic activator to reduce H2O2 Bleaching temperature The research is limited by the factors such as cost and efficiency of organic activators, and the technology has failed to achieve industrial application both internationally and domestically. Against this background, the key technology of low temperature pretreatment for textiles has successfully developed a series of pretreatment processes for textile low-temperature, high efficiency desizing, scouring and bleaching, and has truly realized the industrialization application of grey cloth pressing and low-temperature pretreatment.

The industrialization of low temperature pretreatment technology has benefited from several innovative points of the project, that is, the key technology of ligands synthesis, the key technology of synergistic synergistic effect of mimetic enzyme catalyst, the key technology of low cost and high alkali resistant pectinase industrialization, and the development of low temperature pretreatment process for fabrics.

Mao Zhiping introduced several main contents in detail. "First, aiming at the bottleneck problem of low efficiency and high cost of H2O2 low temperature bleaching, we designed an efficient enzyme mimic enzyme for metal complexes, and developed a short process synthesis process to achieve large-scale production. The Synergistic Technology of organic activator - metal mimetic enzyme catalyst was studied, which improved catalytic efficiency while significantly reducing the cost of catalyst. Its cost was less than 1/5 of organic activator four acetyl ethylenediamine.

Secondly, using the technology of directional gene transformation to improve the production of wild alkaline pectinase producing bacteria, constructing alkaline pectinase engineering bacteria, improving the alkali resistance and pectinase resistance, optimizing the fermentation technology and developing liquid enzyme protection technology, and taking the lead in realizing the commercialization of liquid alkaline pectinase in the country. H2O2

Finally, the H2O2 catalytic stability control system was established to control the decomposition rate of H2O2 in the bleaching process accurately, develop the efficient low temperature wax removal assistants, improve the wool effect of the low temperature pretreatment fabric, develop a series of low temperature pretreatment processes by using alkaline pectinase and mimetic enzyme catalyst, reduce the desizing refining temperature to 35 degree C~40 degree C, and bleach temperature to a minimum of 50 degree C, so as to realize the pretreatment and processing of the fabric according to the quality and demand. The unit product can save water 10%, save energy 35%, reduce CODCr emissions by more than 10%, and save energy and reduce emissions.

　　 Clean production and re wind vane

In the years of popularization and application of the project, 5 extension bases have been set up and 9 demonstration lines have been built. In 2010 ~2012, 5 Application enterprises had accumulated new output value of 359 million 450 thousand yuan, with an additional profit of 60 million 442 thousand yuan.

In terms of social environmental benefits that the industry is paying close attention to, its results are also remarkable. The project has successfully realized the industrialization of textile enzyme degumming Scouring Technology by using domestic enzyme preparation. The desizing temperature has been reduced to 40 ~80 C, the dosage of alkali agent has been reduced by 90%, and the dosage of surfactant has been reduced by more than 50%. The imitated enzyme catalyst was introduced into the printing and dyeing industry, and the pretreatment of textiles at low temperature was successfully realized. The bleaching temperature of the textile was reduced from 100 to 50 ~80 C. The national cotton fabric processing capacity is 30 billion M / year, the technical achievement of the project is 30% according to the popularization rate, it can reduce water consumption by 9 million tons / year, save standard coal 800 thousand tons / year, reduce COD emission 2500 tons / year, reduce the amount of caustic soda 27 thousand tons / year.

How to really realize cleaner production It is the way for the printing and dyeing industry to achieve healthy and sustainable development. "The key technology of low temperature pretreatment for textiles" has set up such an example. Experts and enterprises have said that this technology has broken through the large-scale production technology of alkaline pectinase, and promoted the progress of the bio enzyme industry. It broke through the low cost and mass production technology of mimetic enzyme catalyst, promoted the application of high efficiency accelerator in the printing and dyeing industry, contributed to the technological innovation of printing and dyeing industry, significantly reduced the energy consumption of textile pretreatment, and reduced COD emissions, which is of great significance for promoting energy saving, emission reduction and sustainable development in the printing and dyeing industry.