2 results about "Acoric acid" patented technology

This invention discloses the preparation of furan[3,4-d]-1,3,2-dioxathiol-4(3aH)-one, dihydro-,2-oxide, comprising the following steps: 1. Dissolving D-isoascorbic acid in water and adding sodium carbonate; 2. Adding 40 μL of 50% H2O2 aqueous solution dropwise. o C. Stir the reaction, then heat to 80°C. o C. Stir the reaction, filter while hot, wash with water to obtain a colorless and clear filtrate; 2. Quench the reaction with hydrochloric acid dropwise to acidity, evaporate to dryness under high vacuum to obtain a white solid; reflux with ethyl acetate, filter, evaporate the filtrate by rotary evaporation to obtain a crude intermediate, which is then processed to obtain a white needle-like crystalline intermediate; 3. Dissolve the white needle-like crystalline intermediate in acetonitrile, add thionyl chloride dropwise, and stir the reaction; 4. Pour the reaction solution into ice water, extract with dichloromethane, dry, filter, and evaporate by rotary evaporation to obtain a yellow solid crude product; further processing yields the product. The advantages of this invention are: simple process route, mild and easy-to-control reaction, low purification difficulty, few by-products, and high yield and purity.

The application belongs to the technical field of oil exploitation, and particularly relates to an iron ion stabilizer for oil field acidification and a preparation method thereof. The iron ion stabilizer for oil field acidification is composed of the following raw materials in percentage by weight: 0.1-0.3% of polymeric carboxylic acid, 0.1-0.3% of diethylenetriamine penta-methylene phosphonic acid, 0.05-0.1% of gluconic acid, 0.02-0.05% of isoascorbic acid, and the balance of water. The structural formula of the polymeric carboxylic acid is as follows: wherein n is a natural number greater than 2. The iron ion stabilizer has the advantages of strong iron ion stabilizing capacity and high temperature resistance. The highest iron ion stabilizing capacity at room temperature reaches 242 mg / ml, and the highest iron ion stabilizing capacity after constant temperature at 120 DEG C for 4 hours reaches 238 mg / ml.