Abrégé

The present invention provides a propylene gas freeze drying process, which comprises the following steps: after propylene gas is fed into a propylene evaporator to undergo heat exchange with a liquid refrigerant and be cooled, a gas-liquid mixture at the upper part enters a steam-water separator, and condensate water at the lower part flows into a water storage tank through a gas blocking drainer; the gas-liquid mixture entering the steam-water separator is subjected to speed reduction, collision and condensation to form condensate water, the condensate water is separated from the propylene gas and flows into the water storage tank from the steam-water separator, and the propylene gas enters a tube type heat exchanger; in the tube type heat exchanger, the propylene gas exchanges heat with liquid propylene from a production equipment area to be cooled and then is fed into a propylene compressor inlet of the production equipment area; the liquid propylene is vaporized in the tube type heat exchanger and then returns to the propylene compressor inlet of the production equipment area. According to the technical solution of the present invention, the water content of propylene gas can be reduced to 5.868 g/Nm3 or below, the technological process is simple and reliable, the freeze drying effect is good, and propylene gas in chloropropene production can be conveniently recycled.

Classes IPC  ?

• B01D 53/26 - Séchage des gaz ou vapeurs
• C07C 7/00 - Purification, séparation ou stabilisation d'hydrocarburesEmploi d'additifs
• F25B 19/00 - Machines, installations ou systèmes utilisant l'évaporation d'un frigorigène mais sans récupération de vapeur
• F25B 43/00 - Dispositions pour la séparation ou la purification des gaz ou des liquidesDispositions pour la vaporisation des résidus de fluides frigorigènes, p. ex. par la chaleur

Abrégé

A high-quality water treatment process specifically for chemical production, the process comprising the following steps: sending raw water into a quartz sand filtering tank through a Y-shaped filter, with an anthracite filter material and a quartz sand filter material being arranged in the quartz sand filtering tank; sending the water from the filtration treatment, via the quartz sand filtering tank, into an active carbon filter, with a supporting layer of quartz sand and an active carbon filter being arranged in the active carbon filter; sending the water from the filtration treatment, via the active carbon filter, into a precision filter, with multiple filter elements being arranged in the precision filter; and after subjecting same to the filtration treatment via the precision filter, sending the water to an intermediate water tank for later use. The treated water has a turbidity of not greater than 0.1 NTU, an organic matter COD of not greater than 3 mg/L, heavy metal ions, such as iron and manganese, each not being greater than 0.05 mg/L, and not greater than 150 mg/L of a sulfate. A chemical product is prepared with this high-quality water, which improves the qualities such as the appearance and performances of the prepared chemical product and improves the value of the product. In addition, the process is simple, and the water treatment efficiency is relatively high, which ensures the amount of water required for chemical production.

Classes IPC  ?

• C02F 9/02 - Traitement en plusieurs étapes de l'eau, des eaux résiduaires ou des eaux d'égout comportant une étape de séparation
• C02F 101/20 - Métaux lourds ou leurs composés
• C02F 101/10 - Composés inorganiques
• C02F 101/30 - Composés organiques
• B01D 24/00 - Filtres à substance filtrante non agglomérée, c.-à-d. à substance filtrante sans aucun liant entre les particules ou les fibres individuelles qui la composent

Abrégé

A propylene gas freeze-drying apparatus comprises: a propylene evaporator (106), wherein a propylene gas inlet (108) is provided at a top surface of an end of the propylene evaporator (106), and a liquid refrigerant inlet (110) and a gas refrigerant outlet (112) are provided at a terminal side surface at an end of the propylene evaporator (106); a vapor-water separator (114), wherein a propylene gas outlet (116) is provided at a top surface of the vapor-water separator (114), a gas-liquid mixture inlet (120) is provided at a side surface of the vapor-water separator (114), and is connected to a gas-liquid mixture outlet (118) provided at a side surface of the propylene evaporator (106) via a pipeline, and a first water drainage pipeline (122) is provided at a base portion of the vapor-water separator (114); a refrigerant compressor (126), wherein a gas suction port of the refrigerant compressor (126) is connected via a pipeline to the gas refrigerant outlet (112); and a water condenser (128), wherein a liquid refrigerant outlet and a gas refrigerant inlet are provided on the water condenser (128), the gas refrigerant inlet is connected via a pipeline to a gas outlet of the refrigerant compressor (126), the liquid refrigerant outlet is connected via a pipeline to the liquid refrigerant inlet (110) of the propylene evaporator (106), and the water condenser (128) is provided with a cooling water inlet (132) and a cooling water outlet (134). The apparatus enables freeze-drying of a propylene gas at a normal pressure and achieves a superior dehydration effect, such that the propylene gas discharged from the propylene gas outlet (116) of the vapor-water separator (114) has a water content not greater than 5.868 g/Nm3.

Classes IPC  ?

• B01D 53/26 - Séchage des gaz ou vapeurs

Abrégé

A rectification separation process for a D-D mixture, comprising the following steps: mass transfer separation is carried out on easily carbonized heavy components and light components thereof in a process mother liquor D-D mixture in a heavy component removal tower; dichloropropene and light component evaporation gas phases are controlled to flow back by means of a tower top fractional condenser, and a non-condensable gas phase is directly fed into a light component removal tower; dichloropropane and light components and dichloropropene are subjected to mass transfer separation in the light component removal tower; the dichloropropane and light component evaporation gas phases reach the tower top of the light component removal tower to be cooled, and a tower bottom material of the light component removal tower is fed into a finished product tower; the tower bottom material of the light component removal tower is fed into a finished product tower, cis-1,3-dichloropropene and trans-1,3-dichloropropene are subjected to mass transfer separation in the finished product tower, and a cis-1,3-dichloropropene evaporation gas phase reaches the tower top of the finished product tower and is cooled to enter a cis-form tank; and trans-1,3-dichloropropene is extracted from the side line of the lower part of the finished product tower. According to the process, three-tower continuous and variable-pressure operation and side extraction are adopted, so that the product purity is high, more energy is saved, and the purity of cis-1,3-dichloropropene and trans-1,3-dichloropropene can reach 95% or above.

Classes IPC  ?

• C07C 21/073 - Dichloro-alcènes
• C07C 17/38 - SéparationPurificationStabilisationEmploi d'additifs
• C07C 17/383 - SéparationPurificationStabilisationEmploi d'additifs par distillation

Abrégé

A production process of triallyl isocyanurate, comprising the following steps: adding dimethylformamide and anhydrous calcium chloride into a reactor, and then adding sodium cyanate and propylene chloride into the reactor, maintaining a reaction temperature of 110℃-130℃, adding a catalyst and performing a synthesis reaction of sodium cyanate and propylene chloride in the reactor, the reaction time being 2 h-3 h, the mass ratio of sodium cyanate to propylene chloride being 1:1.1-1.3, and the mass of the catalyst being 0.5%-1.5% of the mass of the reactants; sending a synthetic mother liquor within the reactor into a cooler for cooling, and then performing distillation under reduced pressure to remove the dimethylformamide and sending same to a dimethylformamide high-position tank for recycling; and washing a mixed solution after distillation under reduced pressure by using water, then vacuum distillation refining same, and then performing acid washing by using hydrochloric acid and alkali washing by using caustic soda so as to obtain triallyl isocyanurate. The purity of the triallyl isocyanurate can reach more than 99%, the yield can reach more than 93.5%, the production process is simple, and controllability is high.

Classes IPC  ?

• C07D 251/34 - Esters cyanuriques ou isocyanuriques