Dual-tower argon producing system and process thereof

The invention belongs to the technical field of space division, and in particular relates to a dual-tower argon producing system and a process thereof for producing argon by low temperature fractionation. The process comprises that: an air fractionating tower produces argon fraction containing 6 to 10 percent of argon GAR1; the argon fraction containing 6 to 10 percent of argon GAR1 is introduced into an argon roughening tower II (C3-2) to form argon fraction GAR2; the argon fraction GAR2 is introduced into an argon roughening tower I (C3-1); in the argon roughening tower I (C3-1), oxygen and nitrogen are removed through the rectification of an argon refining tower, and pure liquid argon is formed between the upper section and the lower section of the argon roughening tower I (C3-1), and is extracted to serve as a product. The system and the process have the advantages of simple process flow, low difficulty in controlling each part, investment conservation and high safety.

Early-strength fluorine-free chlorine-free alkali-free liquid accelerator and preparation method thereof

The invention belongs to the technical field of building material concrete admixtures, and provides an early-strength fluorine-free chlorine-free alkali-free liquid accelerator which comprises the following components in percentage by weight: 46%-56% of aluminum sulfate, 2%-6% of a coagulation accelerating early strength agent, 1%-4% of an early strength agent, 6%-9% of a stabilizer, 0.5%-1.5% of an amide monomer, 0.5%-1% of a cationic monomer, 0.02%-0.04% of an initiator, 0.03%-0.05% of a polyether modified silicon defoaming agent and the balance of water. The stabilizer is prepared from triethanolamine monooleate and ethylenediamine tetraethanol in a mass ratio of (0.5-1): 1. According to the invention, triethanolamine monooleate and ethylenediamine tetraethanol are introduced for compounding and synergism, and a cationic high-molecular copolymer is introduced for optimizing the accelerator, so that the cohesiveness of the liquid accelerator is improved, and the stability can reach more ...

High density optical disk and its compound for recording

A high density compact disc and a recording compound thereof