45results about How to "Guaranteed Purity Requirements" patented technology

The invention discloses a device and method for preparing multi-bottle mixed gas, belonging to the field of mixed gas distribution. The device includes dilution gas raw material gas cylinders, component gas raw material gas cylinders, weighing devices, pressure reducing valves, first ball valves, second ball valves, high vacuum baffle valves, vacuum pressure gauges, vacuum pumps, venting control valves, exhaust Empty pipelines, raw material gas main pipelines, precision pressure gauges, product gas manifolds, needle valves, and product gas cylinders; the product gas manifold contains multiple gas pipelines, and the number of needle valves and product gas cylinders is the same as the number of gas pipelines. The quantity is equal. The steps of the method are as follows: Step 1, pipeline connection; Step 2, pipeline evacuation; Step 3, pipeline gas replacement; Step 4, mixed gas preparation; Step 5, pipeline evacuation. The low-concentration gas is prepared by using the device and method of the invention, which reduces the weighing error, improves the gas distribution accuracy, has fast gas distribution speed, is suitable for mass production, and saves the gas distribution cost. And the device is simple, and the method is easy to operate.

The invention discloses a urea separation and purification method which comprises the following steps: a pretreatment operation is performed; coke oven gas feed gas is transported to an oil removal tower for tar removal operation, and when the content of the tar is removed to 23 mg / m<3> or less, the coke oven gas is sent into a first section of a coke oven gas compressor for pressurization operation; the pressurized coke oven gas is subjected to pretreatment operation, and when the content of the tar is removed to 5.5 ppm or less and the content of naphthalene is removed to 1 mg / m<3> or less, the coke oven gas is sent into a second section of the coke oven gas compressor for pressurization operation; the pretreated coke oven gas is transported to a boiler for combustion, or is unloaded after combustion by a torch. The method can be applied to the urea preparation technology field; and with application of the method, gas of mixed feed gas in the preparation process can be effectively controlled, so as to ensure purity requirements of the finally-produced urea.

The invention provides a production method for high-plasticity high-speed steel. The production method comprises steps of selecting materials according to parts by weight of all elements of the high-speed steel to be prepared, and controlling the contents of harmful elements in the raw material; smelting by a vacuum induction melting furnace, casting so as to obtain a consumable electrode bar; remelting the consumable electrode bar by a vacuum consumable remelt furnace so as to obtain a high-speed steel remelting ingot, wherein a calcium iron wire is tied on the consumable electrode bar in vacuum consumable process; cogging the high-speed steel remelting ingot, then forging, hot rolling so as to obtain a high-speed steel coil rod, annealing the coil rod so as to obtain the high plasticity high-speed steel. The production method is simple and easy to control and can be used for preparing high-plasticity high-speed steel.

The invention relates to a device for producing propylene oxide, which mainly solves the problem of high energy consumption in the prior art. The present invention preferably solves this problem by adopting equipment including a reactor, a flash tank, a high-pressure propylene recovery tower, a low-pressure propylene recovery tower and a depropanizer, and can be used in the industrial production of propylene recovery in a propylene oxide plant.

The invention relates to a method for producing propylene oxide, which mainly solves the problem of high energy consumption in the prior art. The present invention adopts the following steps: CHP and propylene generate a liquid phase stream in the reactor; the liquid phase stream enters the middle part of the high-pressure propylene recovery tower, the first light component is obtained from the top of the tower, the first heavy component is obtained from the tower kettle, and the side line is obtained from the middle part of the tower Logistics; the side stream is divided into the first side stream and the second side stream; the first side stream enters the middle of the depropanizer, the second light component is obtained from the top of the tower, and the second heavy component is obtained from the bottom of the tower; the first heavy component enters the flash evaporation Tank, the third light component at the top of the tank, the third heaviest component at the bottom of the tank; the third light component enters the middle of the low-pressure propylene recovery tower, the third heaviest component enters the first tray at the top of the tower, and the fourth light component at the top of the tower Component, the fourth heavy component is obtained in the tower still; the fourth light component enters the high-pressure propylene recovery tower tower; the technical scheme of the second side stream and the second light component recycling back to the reactor solves this problem well, and can be used In the industrial production of propylene oxide.