Preparation of pyrogallic acid with pyridine as decarboxylation catalyst of 3,4,5-trihydroxybenzoic acid

Abstract

Production of pyrogallic acid with pyridine as gallic acid decarboxylation catalyst is carried out by agitating and mixing anhydrous gallic acid with pyridine, refluxing reacting, material forming melt, CO2 bubbles escaping, keeping temperature until bubble not escaping from reacting product, keeping temperature of reacting product, releasing pressure of the atmosphere, distilling out pyridine of reacting product, raising temperature for the reacting product, collecting escaped sublimed product until sublimed product non escaping, grinding the sublimed product, adding chloroform, agitating and washing, dissolving the residual pyridine into chloroform, filtering, drip washing by chloroform, filtering, drying, removing residual chloroform, and obtaining pyrogallic acid. It achieves low boiling point, suitable alkalinity and easy separation.

Description

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine

Login to View More

AI Technical Summary

Benefits of technology

This patented method allows for better control over producing pure or enriched carbons that have specific properties such as alkali metal content, density, crystal structure, etc., while still maintaining their desired qualities like heat conductivity and electrical insulation property.

Problems solved by technology

Technological Problem addressed in this patented text describes various techniques described during chemical industry's discovery phase called semisynthesis. These include different types of reaction processes like thermal decomposition, partial ester formation with carbonyl hydride, nitro compounds reduction reactions, organocatalysed depolarizations, and enzymatic hydrolyzations. However, these conventional methods suffer drawbacks including production yields being too low due to side products produced while producing pyrocitric acid, impurity issues involved when isolating pure pyritiirconium dioxaphosphorus complex salt, difficulty controllably attaching specific functional groups on pyranosilane molecules, and limitations associated with current technologies involving multiple steps.

Images