37 results about "Micro gas chromatography" patented technology

Improved micro-columns and methods for producing micro-columns particularly suitable for use in gas chromatographs are disclosed. In particular, following deposition of the stationary phase coating, the micro-columns are subjected to a postcoating treatment with a molecule that binds to the active sites in the stationary phase micro-column thereby eliminating or reducing loss of gas chromatograph performance associated with those active sites. The postcoating treatment molecule binds to the same active sites as the analytes of interest.

The invention discloses a miniature gas chromatographic column integrated chip with rapid separation function, and relates to gas chromatographic column integrated chip technology. The integrated chip includes a miniature chromatographic column, combined miniature heaters, and combined miniature temperature sensors. Miniature chromatographic column channels are formed on a silicon substrate by deep etching or chemical etching based on microelectromechanical system (MEMS) technology, then the silicon substrate is hermetically bonded with glass to form the miniature chromatographic column; before bonding, the combined miniature heaters are integrated in the channels and the substrate bottom where the channels are located; and through combined heating, rapid temperature rise is realized, and separation speed and separation performance of the miniature chromatographic column are improved. Meanwhile, the combined miniature temperature sensors are integrated on the upper and the lower surfaces of the channels and in the channels of the miniature chromatographic column, to real-time respond temperature of a gas sample in the miniature chromatographic column, thereby facilitating heating state adjustment of the miniature heaters by an external control circuit, controlling temperature of the miniature chromatographic column, and enabling the miniature chromatographic column to achieve rapid separation, and excellent total separation performance is realized.

A method for preparing hydrogen from thermochemical reaction of sludge comprises the steps: putting crushed dry sludge and a sodium hydroxide solid into an alumina magnetic boat, and mechanically stirring to make the two components mixed evenly; putting the alumina magnetic boat into a tubular furnace, introducing nitrogen gas, making the tubular furnace full of nitrogen gas, and connecting an outlet of the tubular furnace with a condensing device; starting a reaction, continuously introducing nitrogen gas in the reaction process, and providing an inert pyrolysis atmosphere; setting a tubularfurnace heating program, staring up the tubular furnace, and maintaining for a certain time after the final temperature is reached; and collecting gas from the rear of the condensing device in the reaction process. The invention also provides a system for preparing hydrogen from the thermochemical reaction of the sludge, wherein the system comprises the tubular furnace; the outlet of the tubular furnace is connected with the condensing device; a gas outlet of the condensing device is connected with a gas collecting bag and a micro gas chromatograph analytical instrument with a micro gas chromatograph analytical result output display screen via a three-way valve. The method and system have the advantages of easily obtained raw materials, short hydrogen production process, simple operation and effective absorption of greenhouse gas under high temperature pyrolysis conditions.

The invention provides a silicon-based micro-gas chromatographic column with high separation efficiency and a preparation method thereof. The preparation method includes: 1) making a microchannel and a microfluidic port on a silicon substrate; 2) making a mask layer to protect The bonding surface on the silicon substrate; 3) constructing nanometer mesoporous silicon oxide in the micro-channel; 4) bonding a packaging cover plate to the bonding surface of the silicon substrate; 5) based on The components to be separated form corresponding modification materials on the surface of the nanometer mesoporous silicon oxide. Since nano-mesoporous silica has a large specific surface area and pore volume, and has good thermal stability and mechanical strength, the present invention constructs it in a silicon-based micro-gas chromatography column, which can greatly improve the separation of the chromatographic column. Efficiency: The surface of nanometer mesoporous silicon oxide has a high density of silanol (Si‑OH), which can further construct a monomolecular layer with different separation functions on the surface according to the different separation objects to achieve the desired separation effect.