3results about How to "Molecular small" patented technology

This application discloses a method and apparatus for predicting and controlling dissolved gas precipitation at the end of brine discharge in a salt cavern gas storage facility, comprising the following steps: acquiring basic data required for prediction and control at the end of brine discharge; establishing or calling a table of equilibrium solubility data of the stored gas in the brine based on the composition, pressure, temperature, and salinity of the stored gas; determining the initial dissolved gas state of the brine at the interface, using the boundary condition that the brine and stored gas reach dissolution equilibrium at the gas-liquid interface of the salt cavern; establishing a coupled calculation model of dissolved gas precipitation and wellbore gas-liquid two-phase flow during the brine return process to predict the gas phase volume fraction of the fluid returning from the wellhead; generating a safe operating envelope diagram of back pressure-discharge rate at different gas-liquid interface positions, using the wellhead back pressure as the main control variable and the brine discharge flow rate as the auxiliary correction variable, with the wellhead back pressure as the main control variable and the brine discharge flow rate as the auxiliary correction variable; and outputting a suggested point for terminating brine discharge when any wellhead safety constraint cannot be met.

This invention relates to a chromium-free tanning agent based on hydrogen bond reinforcement and its preparation method. The invention first prepares single-terminated and double-terminated -NCO ureapyrimidine ketone compounds, then reacts these compounds with an aqueous solution of bisulfite to prepare a water-soluble reactive ureapyrimidine ketone-based chromium-free non-metallic tanning agent. Compared with conventional organic synthetic tanning agents, the chromium-free tanning agent developed in this invention can both covalently bind with skin collagen and further form a quadruple hydrogen-bonded dimer in the leather fiber network through the hydrogen bond recognition effect of ureapyrimidine ketones (Upy). This strong hydrogen bonding between tanning agent molecules strengthens the molecular cross-linking network structure of the tanned leather, resulting in higher shrinkage temperature and mechanical strength. In particular, the tanning agent developed in this invention contains two types of tannin molecules of different sizes, exhibiting excellent selective filling effect. The tanned leather is full and uniform, with good softness, and can be used in the production of light-colored lightweight leather.

This application provides a bio-based chain extender and its application. The bio-based chain extender includes the bio-based compounds 2,5-furandicarboxaldehyde dioxime and / or 5-hydroxymethyl-2-furancarboxaldehyde dioxime. Using these as bio-based chain extenders, modified polyurethanes with antibacterial and antifungal properties can be synthesized. This imparts long-lasting, stable, and broad-spectrum antibacterial and antifungal properties to polyurethane materials, eliminating the need for additional antibacterial agents. This avoids problems such as environmental pollution, short antibacterial time, and unstable antibacterial performance caused by antibacterial agent migration during the use of polyurethane materials. In particular, this bio-based chain extender is bio-based, safe, and environmentally friendly, and has a significant effect on the antibacterial and antifungal modification of polyurethane materials, showing broad application prospects in medical materials, public facilities, and health protection.