189 results about "Micropore filtration" patented technology

A method and system for water-priming carbon micropore filter media using negative pressure. The method includes placing dry filter elements in a polymer bag, applying a vacuum of no more than approximately 33 kPa above zero pressure, and heat-sealing the bag using a heat-set bar; submerging, by a consumer, the vacuum-sealed bag with its the filter elements in water; the filters in the vacuum sealed bag are at least partially submerged, puncturing the bag to form one or more small openings in the bag below the water line. Breeching the vacuum causes the water to flow through the openings into the bag and the filter(s) to equalize the pressure between the water and the previously vacuum environment of the plastic bag, causing the surrounding water to quickly flow into the micro-pores of the filter media, thereby priming the carbon filter for use in the gravity-fed water-purification system.

The invention discloses a method for preparing glyphosate, and the method comprises the following steps: 1) mixing raw material water, a N-Phosphonomethyl aminodiacetic acid and active carbons in certain proportion so as to obtain a suspension, adding the obtained suspension into a pressure reaction kettle, and closing the pressure reaction kettle to carry out oxidation reaction on the suspension, so as to rapidly oxidize the N-Phosphonomethyl aminodiacetic acid; and carrying out sampling analysis on the mass fraction of the N-Phosphonomethyl aminodiacetic acid in reaction liquid, when the N-Phosphonomethyl aminodiacetic acid is completely transformed, stopping feeding oxygen into the reaction kettle, and carrying out pressure relief until the reaction kettle is at ordinary pressure; 2) raising the temperature of the materials subjected to reaction to 80-100 DEG C, filtering the materials by using a microporous filtering device so as to obtain a filter cake I mainly containing the activated carbons and a mother solution I; and 3) carrying out continuous multi-effect crystallization on the mother solution I, separating solids from the mother solution I by using the microporous filtering device so as to obtain a filter cake II and a mother solution II, and drying the filter cake II so as to obtain a glyphosate chemical. The method disclosed by the invention is safe in operation, short in reaction period, high in production efficiency, low in production cost, low in energy consumption, and less in emission of'three wastes'.