54results about How to "Effective desorption" patented technology

A fuel vapour storage canister, e.g. a carbon canister for use in an automobiles evaporative fuel vapour emissions control system is described. The canister comprises a housing defining an inner wall and an outer wall; a first fuel vapour storage compartment arranged within a volume defined by the inner wall; and a second fuel vapour storage compartment in fluid communication with the first vapour storage compartment via an air-flow channel, wherein the air-flow channel includes a section arranged to pass between the inner and outer walls of the housing and to provide a heat-exchange function. Thus air cooled by endothermic desorption in the second fuel vapour compartment during canister purging may be warmed by the ambient air (or other thermal mass) surrounding the outer wall before it reaches the first fuel vapour compartment, thus providing for more efficient desorption in the first fuel vapour compartment. Likewise, air heated by exothermic absorption in the first fuel vapour compartment during canister loading may be cooled by the ambient air before reaching the second fuel vapour compartment, thus providing for more efficient absorption in the second fuel vapour compartment.

The invention discloses a method for repairing polluted soil through low-temperature thermal desorption with chemical drip washing. The method comprises the following steps: firstly, performing low-temperature thermal desorption treatment on mercury polluted soil so as to remove metal mercury, organic combined mercury and a part of inorganic combined mercury with a low melting point in the soil; secondly, performing drip washing with a mixed liquid containing organic acids, iodate and chlorine salts so as to remove mercuric oxide with a high melting point; and finally performing drip washing on mercuric sulfide with a high melting point with a mixed liquid of sodium sulfide and sodium hydroxide. By adopting the method, efficient removal of mercury of multiple valence states in mercury polluted soil can be achieved, a small amount of mercury is retained, the removal rate of mercury is up to 95% or greater, secondary pollution to the environment is avoided, and the cost is low.

The invention discloses an aluminum quantum well laser and a preparation method thereof. The preparation method comprises the following steps: using ammonium polysulfide solution to treat oxides on the etching surface, and forming a sulfide protective layer; using metal-organic vapor phase deposition on the surface of an InP substrate The waveguide layer and the third InP layer are grown sequentially. During the temperature rise process before metal-organic vapor phase epitaxy growth, the etched surface is baked to desorb the sulfur atoms of the sulfide protective layer, and the sulfur element is generated and sublimated with the carrier gas. Compared with the traditional passivation technology, the invented process for solving the oxidation problem of the etching surface of the aluminum-containing quantum well laser has low cost, simple process and strong stability.

The invention discloses a treatment method for oil field acidic sewage. The method is characterized by comprising the steps that firstly, air or nitrogen and oil field acidic sewage form parallel flow for gas-liquid mixing through a tubular static mixer, the gas-liquid volume ratio is controlled to be 2.5-3.0 at the temperature of 55-65 DEG C, the gas-liquid dispersion degree is smaller than 0.5 mm, and the time spent by the parallel flow in passing through the tubular static mixer is 2-5 seconds, the Reynolds number of the gas-liquid mixed flowing state is larger than 3000, then, sewage with acidic gas desorbed through gas-liquid hydrocyclone separation is fed into the flocculation and sedimentation procedures, and finally water with sediments separated out through flocculation and settlement is drained out. The method is adopted for treating the oil field acidic sewage, and the pH value of the sewage can be increased from 5.5-7.0 to 7.0-7.5. Meanwhile, the sewage corrosion rate can be controlled within 0.02 mm / a. According to the method, no alkaline chemical agent is added; the rapid and efficient gas-liquid mixing method is adopted, so that the equipment scaling possibility is effectively decreased. The method is used before flocculation and settlement of oil field sewage, can remarkably improve the flocculation and settlement effect and can effectively lower the dosage of a flocculant.