857results about How to "No change" patented technology

The process for extraction consists the steps of, identifying the source of the raw material, extracting and concentrating the raw material, mixing the extractive with thin layer silica gel by the proportion of 1:1, loading column by the ratio of sample : thin layer chromatography silica gel = 1:0.5, and washing with expansion agent. The invention realizes an extraction process with an increased standard body purity.

The present invention relates to a natural gas hydrate core under-pressure transfer method, which comprises: establishing end-to-end connection between a pressure keeping cylinder filled with a core tube and a transfer bin having the specification equivalent to the pressure keeping cylinder, conveying the core tube in the pressure keeping cylinder into the transfer bin, sealing the transfer bin, and disconnecting the connection of the pressure keeping cylinder, wherein the pressure of the transfer bin and the initial state pressure of the pressure keeping cylinder are always maintained the same during the steps. The invention further relates to an apparatus applying the method, wherein the opposite connection ends of the pressure keeping cylinder and the transfer bin are respectively connected with a pressure keeping cylinder valve and a transfer bin valve, the valves are sealed and communicated through a flange, and the internals of the pressure keeping cylinder and the transfer bin respectively establish a connection with a pressure balancing control system. According to the present invention, the natural gas hydrate is in the under-pressure state, such that it is ensured that gas, pore water and other components in the core are not changed, and the detected data after the core treatment is close to the in situ situation so as to provide basis for analysis of natural gas hydrate characteristics and determination of reserves.