40results about How to "Overcoming a large amount" patented technology

The detection device relates to a detection device and detection method for the content of flue gas in asphalt; the detection device comprises a distillation flask; the distillation flask is arranged in an oil bath heater; the distillation flask is connected with a gas outlet pipe; the distillation flask is connected with a sample bottle through the gas outlet pipe; the sample bottle is connected with an activated carbon pipe; the distillation flask is provided with a plug with a stopper; when the device is used, a heat resistant magnetic rotor is put into the distillation flask through a neck mouth. The problems that a conventional asphalt flue gas measurement device has large asphalt use amount, narrow test temperature range, poor temperature control precision, complex composition and operation and the like are solved, so the device has the advantages of small use amount of the sample, high temperature-control range, high temperature-control precision, simple composition, convenience in measurement and the like, and simultaneously obtains the contents of heavy flue gas and light flue gas.

The invention relates to a preparation method of a polycrystal SAPO-53 molecular sieve, and the preparation method comprises the following steps of: adding hexamethonium bromide and alkali metal hydroxides to an organic solvent which contains a sedimentation promotor for ion exchange; filtering to remove sediments, and evaporating the organic solvent to obtain template agent hexane diammonium hydroxide; adding a silicon source, an aluminum source, a phosphorus source and the hexane diammonium hydroxide to water according to the mole ratio of SiO2:Al2O3:P2O5:R(OH)2:H2O=(0.1-15):1:(0.8-20):(0.3-25):(10-80), and stirring to form uniform gel; statically crystallizing at autogenous pressure inside a reaction kettle at 130-190 DEG C for 1-4 days; and filtering, washing and drying to obtain white SAPO-53 molecular sieve solid powder. The preparation method disclosed by the invention has the advantages of simplicity, easiness for operation and small usage amount of the template agent, greatly shortens the crystallization time, reduces the synthesis difficulty and production cost of a molecular sieve and can meet the particular requirement of different application occasions on the molecular sieve by controlling the appearance and particle diameter of a crystal by changing a reaction condition.