Loading patent…
AssigneeDow Global Technologies LLC
InventorsDanil Tirtowidjojo, Andrei S. Merenov, Christian D. Kneupper, Bruce D. Hook, Anil I. Mehta
Estimating the term…
A process and apparatus for recovering dichlorohydrins from a mixture comprising dichlorohydrins, one or more compounds selected from esters of dichlorohydrins, monochlorohydrins and/or esters thereof, and multihydroxylated-aliphatic hydrocarbon compounds and/or esters thereof, and optionally one or more substances comprising water, chlorinating agents, catalysts and/or esters of catalysts is disclosed. The mixture is distilled or fractionated to separate a lower boiling fraction comprising dichlorohydrin(s) from the mixture to form a higher boiling fraction comprising the residue of the distillation or fractionation. The higher boiling fraction is stripped to recover remaining dichlorohydrins. Advantages include more efficient recovery of dichlorohydrins for a given distillation column, less waste due to avoiding the conditions conducive to the formation of heavy byproducts, and reduced capital investment in recovery equipment.
A process for recovering dichlorohydrin(s) from a mixture comprising dichlorohydrin(s), one or more compounds comprising ester(s) of chlorohydrin(s), monochlorohydrin(s), and/or multihydroxylated-aliphatic hydrocarbon compound(s) and/or ester(s) thereof, and optionally one or more substances comprising water, chlorinating agent(s), catalyst(s)s, ester(s) of catalyst(s), and/or heavy byproduct(s), wherein the process comprises:
The process according to any one of the preceding claims, wherein 10 to 95 percent of the total amount of dichlorohydrin(s) in the mixture provided in step (a) is recovered in the lower boiling fraction of step (b).
The process according to any one of the preceding claims, wherein step (b) is carried out at a pressure in the range from 1 kPa to 0.12 MPa.
The process according to any one of the preceding claims, wherein the temperature of the higher boiling fraction during step (b) is in the range from 50° C. to 139° C.
The process according to any one of the preceding claims, wherein the stripping agent is an azeotroping agent for dichlorohydrin(s) during step (c).
The process according to any one of the preceding claims, wherein the stripping agent comprises steam.
The process according to any one of the preceding claims, wherein at least one monochlorohydrin and/or ester thereof is present in the mixture provided in step (a) and in the high-boiling fraction of step (b).
The process according to any one of the preceding claims, wherein at least one multihydroxylated-aliphatic hydrocarbon compound and/or ester thereof is present in the mixture provided in step (a) and in the high-boiling fraction of step (b).
The process according to any one of the preceding claims, wherein the mixture provided in step (a) further comprises a catalyst for hydrochlorinating monochlorohydrin(s) and/or ester(s) thereof and/or multihydroxylated-aliphatic hydrocarbon compound(s) and/or ester(s) thereof.
The process according to any one of the preceding claims, wherein stripping agent is also introduced into the higher boiling fraction of step (b) while the same higher boiling fraction is distilled or fractionated according to step (b) for contact with the higher boiling fraction undergoing distillation or fractionation and stripping dichlorohydrin(s) from the higher boiling fraction.
The process according to any one of the preceding claims, wherein the mixture provided in step (a) is in the liquid-phase.
The process according to any one of the preceding claims, wherein the mixture of step (a) comprises water.
The process according to any one of the preceding claims, wherein step (c) comprises distilling or fractionating the vapor fraction of step (c) for isolating dichlorohydrin(s) and stripping agent.
The process according to any one of the preceding claims, wherein step (b) is carried out using a packed distillation column.
The process according to any one of the preceding claims, wherein the amount of heavy byproducts in the high boiling fraction of step (b) does not exceed 110 percent of the amount of heavy byproducts in the mixture provided in step (a).
The process according to any one of the preceding claims, wherein dichlorohydrin(s) are recovered from the lower boiling fraction of step (b) and/or the vapor fraction of step (d).
A method for producing dichlorohydrin(s) comprising a process according to any one of the preceding claims, wherein the mixture provided in step (a) is produced or derived from hydrochlorination of monochlorohydrin(s) and/or ester(s) thereof and/or multihydroxylated-aliphatic hydrocarbon compound(s) and/or ester(s) thereof in the presence of a chlorinating agent.
An apparatus suitable for producing dichlorohydrin(s) from multihydroxylated-aliphatic hydrocarbon compound(s) and/or ester(s) thereof comprising:
Dependencies are inferred from the claim text.