1992, domestic Qingdao Jiaonan Chemical Plant (now Qingdao Tianyuan Chemical Co., Ltd.), Jilin Longjing Chemical Plant No.2 and Changshu Pigment Chemical Plant successively built production devices. By 1995, eight domestic enterprises have successively produced CLT acid, with an apparent capacity of 2,600 tons/year, and the actual output in 1995 was 195.
China CLT acid can not only meet the domestic demand around 1994, but also export a small amount; Due to the differences in production technology and management level, several enterprises stopped the production of CLT acid around 1995 due to production costs, environmental protection and other reasons. As the developed countries in the world pay more and more attention to environmental protection, many developed countries shut down and switch to CLT acid production facilities. In addition, with the improvement of people's living standards in China, the use of pigment Guangjinhong C and rubber scarlet LC synthesized from CLT acid is gradually increasing, and the export volume is increasing day by day, which promotes the development of CLT in China. During the period of 1997, the output and export of CLT acid in China developed rapidly. Domestic CLT acid and its downstream products have been in short supply in the international market. In half a year, the price rose from 18500 yuan/ton to 23500 yuan/ton, and the highest selling price of some manufacturers reached 25500 yuan/ton. On the basis of domestic scientific research for many years, Hebei Qinyan Chemical Co., Ltd., Qingdao Tianyuan Chemical Co., Ltd. and Jihua Liaoyuan Chemical No.1 Plant have successively invested in expanding the capacity of CLT acid, becoming the three major domestic production enterprises. By the end of 1997, the total production capacity of CLT acid in China reached 5,200 tons, making it the largest producer and exporter of CLT acid in the world.
With the improvement of domestic CLT acid production capacity, the saturation of domestic and international market demand, and the impact of the Asian financial crisis, domestic CLT acid production enterprises have been hit hard at 1999, and their prices have plummeted rapidly, reaching a minimum of 16000 yuan.
2 1 century, the production of CLT acid reached a new climax. With the expansion of domestic pigment production bases such as Changzhou North America, Hangzhou Lily, Penglai Guangxin, and the eastward movement of the world dye (pigment) production center, many international companies such as Klein and BASF have successively set up CLT acid downstream product production facilities in China, which has brought another new opportunity to the CLT acid production industry in China. Hebei Qinyan Chemical Co., Ltd., Qingdao Tianyuan Chemical Co., Ltd. and Jihua Liaoyuan No.1 Chemical Plant all quickly increased their production capacity to more than 2,000 tons/year. Considering pollution, market and other factors, Hebei Qinyan Chemical Co., Ltd. closed its production enterprise in Funing, Qinhuangdao, Hebei Province, and built a new factory with a capacity of 5,000 tons/year in Shangyu, Zhejiang Province in 2002. In 2003, Weifang Dacheng Chemical Co., Ltd. built a 300-ton/year production line and quickly increased its production capacity to 600 tons/year. By the end of 2003, the production capacity of CLT acid in China has exceeded 1 10,000 tons, reaching10.06 million tons/year.