40results about How to "Good high temperature and corrosion resistance" patented technology

The invention relates to a process gas chromatograph. The process gas chromatograph comprises an alloy substrate, a master controller, a chromatographic detection module, an automatic sampler, a flow distribution module, a chromatographic separation module, a data acquisition module, a time control module, a power module, a gas impurity detection device, a gas leakage detection device, an alarm device, an automatic stop module and a protection shell. The process gas chromatograph can complete multi-path gas phase detection automatically; besides, the process gas chromatograph has good high temperature resistance and corrosion resistance and can be reliably used for a long time; furthermore, result errors caused when impurities are mixed into gas samples can be completely eliminated, further losses of production and study can be avoided, and gas leakage can be found in time once happening; the process gas chromatograph is simple in structure, wide in measurement range and high in response speed and has universality and response sensitivity to many substances, and response signals are stable.

The invention relates to a highly-permeable ultrafiltration composite ceramic coating film and a preparation method thereof, and belongs to the technical field of film separation. The highly-permeable ultrafiltration composite ceramic coating film comprises a ceramic base film, wherein the surface of the ceramic base film is sequentially provided with a silane coupling layer, a polyimide layer from interior to exterior; the mass ratio of the ceramic base film to the silane coupling layer to the polyimide layer is 1:(0.001 to 0.005):(0.01 to 0.1). The highly-permeable ultrafiltration composite ceramic coating film has the advantages that hyperbranched polyamide-amide is used as a pore passage building template, polyimide is used as a separating film, and the polyimide is grafted to the surface of the ceramic film in a covalent way by in-situ polymerizing, so that the composite separating film can simultaneously reach the high-selectivity and high-permeability advantages of a polymer film and high temperature-resistant and corrosion-resistant advantages of an inorganic film; the pore passage size and structure of the commercial ceramic film are improved, and the good permeability of the separating film is realized.

The invention discloses a method for preparing a low-naphthalene and high-boiling-point aromatic hydrocarbon solvent used for rubber resin plasticizers, comprising the following steps: firstly preparing a loaded hydrogenation catalyst and a naphthalene-removing agent, and then using cracking C 10 The distillate is used as raw material, which is subjected to hydrogenation and denaphthalene treatment in sequence, and finally added to the rectification tower, and the vacuum system of the rectification tower is turned on, and the vacuum degree is adjusted to ‑0.09MPa; the reboiler of the rectification tower is started to be heated The system controls the tower top temperature at 165.5°C and the tower bottom temperature at 269.2°C, and performs vacuum rectification. The gas phase of the rectification process is condensed by the top condenser of the rectification tower, and the condensate enters the reflux tank, and the uncondensed gas phase undergoes rectification. The condensate trap at the top of the tower is condensed and collected, and the captured condensate enters the reflux tank, the reflux flow is controlled, and the fraction at 260‑280 ° C is collected to obtain the target product. The method is simple in operation, low in cost, low in naphthalene content in the prepared aromatic hydrocarbon solvent, non-toxic and environment-friendly.

The invention discloses a high-temperature high-pressure sampling valve used in deep water. The sampling valve mainly comprises a valve body, a valve housing, a first valve core, a second valve core, a spring cavity and a return spring. The invention has the two-way self-fastening sealing capacity due to the adoption of the structural manner of two valve cores, so that the sampling valve has excellent sealing performance under a high pressure. The sampling valve has superior high-temperature resistance and decay resistance, thereby improving the fidelity of thermal water samples. The samplingvalve opens under linear driving, and closes automatically following the withdrawl of external driving force, thereby increasing the convenience of use in deep water.

The invention discloses a preparation method of a positively-charged ceramic micro-nano fiber membrane. The preparation method comprises the steps of adding spinnable polymer in a solvent, then adding a ceramic precursor in the solvent, and obtaining spinning solution after stirring and aging; pouring the spinning solution in a micro pump, adopting an injection needle head which is scraped smoothly as a spray nozzle, and obtaining composite fiber through electrostatic spinning; firstly roasting the composite fiber in anoxic atmosphere at 200-500 DEG C, then roasting the composite fiber in inertia or reducing atmosphere at 400-400 DEG C for 1-5 hours, and obtaining the positively-charged ceramic micro-nano fiber membrane. According to the preparation method of the positively-charged ceramic micro-nano fiber membrane, disclosed by the invention, the positively-charged ceramic micro-nano fiber membrane which is prepared by combining the electrostatic spinning and a step-by-step roasting technology has high porosity, high specific surface area, high surface electrical performance and good high-temperature-resisting and corrosion-resisting performances, has great advantages of separating, shielding and removing bacteria and virus and has a wide application prospect in environment cleaning, pharmaceuticals production, bioengineering, foundation medicine and the like.