Distillation can be divided into tower distillation and towerless distillation.

Judging from the history of world distillation development, 3000-5000 years ago, there were separation and purification requirements in the production of alcohol. However, the content of long-term liquor is around 15-20 degrees. After countless inventors' research, prototype separation devices are available. The 42-56 degrees ethanol is a peak of purification, which is the current content range of liquor. More than 200 years ago, French inventors used distillation towers to produce 95% ethanol, which was a recognized record in the distillation industry. More than 30 years later, British inventors invented rectification towers based on distillation towers and produced With 99-99.9% ethanol, the word "alcohol" was produced for the first time, meaning the essence of wine. Methanol or ethanol production plants, lined with 20-120 meters high and 0.3--13.5 meters in diameter. Distillation [rectification] towers, with various structures, all derived from the products of French and British inventors. The largest distillation [rectification] tower The annual production can reach 50,000 to 300,000 tons, which is the main purification method for organic solvents.

Beginning in 2005, Anyang Haichuan Chemical Research Institute (formerly Anyang High-tech Zone Contemporary Chemical Research Institute) began its unique purification research. Many domestic users call it towerless distillation (rectification) and towerless refining.

In December 2010, the tower-less refining equipment was launched and obtained the patent certificate; from March to August 2011, the tower-less distillation machine and the tower-less rectification machine came out, one patent was authorized, and one patent passed the preliminary examination. 20% ultra-low content waste methanol industrial purification test, the results were used in a large pharmaceutical production company in Shangqiu City, Henan Province, and the initial fraction content was 86%; in August 2011, a large pharmaceutical company in Anyang City, Henan Province, on 82 % Waste ethanol industrial purification test, the tower-free distillation [extended range] machine was purified to 98%, and the methyl acetate content in the ethanol was 0.1%, which was significantly better than the 0.26% separation effect of the factory’s distillation tower. After the 2010s, towerless distillation equipment has been highly valued by users in the purification of many organic solvents. The institute is not only committed to the research and development of separation equipment, but also strives to raise the accumulated rich purification experience to a theoretical height.