2results about How to "Reduce refining costs" patented technology

The invention relates to the technical field of compound purification, and particularly discloses a malononitrile purification method. The purification method of malononitrile specifically comprises the step of separating malononitrile from a malononitrile crude product through adoption of a melt crystallization method. According to the malononitrile purification method provided by the invention, a vacuum system does not need to be arranged, the required temperature is relatively low, the energy consumption is reduced by 50% or above, the refining cost and refining time of malononitrile are greatly reduced, and the finally obtained malononitrile pure product has extremely high purity and yield.

The large-evaporation-capacity low-pressure spray head comprises a flow channel pipe and a spray nozzle which are communicated, the flow channel pipe is provided with a first limiting body, a second limiting body and a swing body, the swing body is movably installed between the first limiting body and the second limiting body, and the swing body is connected with a water dispersing disc. The water dispersing disc is provided with a water dispersing needle located in the center and a plurality of flow channels arranged in the circumferential direction of the water dispersing needle, the flow channels rotationally extend from the water dispersing needle to the edge of the water dispersing disc, and water dispersing rib plates extending into the flow channels in the axial direction of the flow channels are arranged in the centers of the flow channels close to the edge of the water dispersing disc. The spray nozzle is used for jetting water to the water dispersing needle and driving the water dispersing disc to swing up and down and circumferentially around the spray nozzle along with the swing body, the spray nozzle can give consideration to the jetting range and the stable operation characteristic under the low-pressure working condition, the atomization evaporation capacity and the combination uniformity of the spray nozzle are effectively improved, the evaporation rate can reach 16% or above, and the Crisqin uniformity can reach 90% or above. The swinging body is detachably connected with the water dispersing disc, dismounting and replacement are easy, and the requirements for waste liquid recovery and cost saving of modern industries such as the mining industry are met.