HYDROTHERMAL FEEDSTOCK TREATMENT
The disclosure provides a process for a hydrothermal feedstock treatment including direct steam injection and cooling, which may be performed in the absence of a reactor. The process can be used to reduce inorganic and organic contaminants, such as salts, minerals, metals, asphaltenes, polymers, and coke precursors in both renewable and non-renewable feedstocks.
1 . A process for treating a feedstock comprising:
optionally, pretreating the feedstock using steam degumming, forming a pretreated feedstock;
pressurizing a pretreated feedstock above 2 MPa;
injecting steam directly into the pretreated feedstock, forming a heated feedstock and water stream,
immediately cooling the heated feedstock and water stream; and
producing a cooled product stream.
2 . The process of claim 1 , further comprising:
depressurizing the cooled product stream; and
separating the cooled product stream by supplying the cooled product stream to a separator, thereby producing a treated feedstock and a separated water stream, optionally further purifying the treated feedstock.
3 . The process of claim 1 , further comprising preheating the feedstock before the step of injecting steam.
4 . The process of claim 1 , further comprising steam degumming, enzymatic degumming, water degumming, or a combination thereof, before the step of injecting steam.
5 . The process of claim 2 , wherein the separating step comprises centrifugal separation.
6 . The process of claim 1 , wherein the feedstock comprises a petroleum-based feedstock or a renewable feedstock, and a contaminant.
7 . The process of claim 6 , wherein the renewable feedstock comprises a glyceride-based lipid.
8 . The process of claim 1 , wherein the pretreated feedstock is pressurized from 3 to 10 MPa; and wherein the steam has a pressure of from 3 to 10 MPa.
9 . The process of claim 1 , wherein the steam injection step heats the feedstock to a temperature above 200° C.
10 . The process of claim 1 , wherein the cooling step comprises reducing the temperature of the heated feedstock and water stream to 90° C. or less over a period of 30 seconds to 15 minutes, 30 seconds to 10 minutes, 30 seconds to 5 minutes, or 30 seconds to 1 minute, inclusive.
11 . The process of claim 2 , further comprising supplying the separated water stream to a water reclaiming process, the water reclaiming process comprising:
heating the separated water stream in a first evaporator to a temperature between 120° C. to 160° C., producing a first heated water stream.
12 . The process of claim 11 , further comprising:
heating the first heated water stream in a second evaporator to a temperature between 110° C. to 150° C., to produce a second heated water stream; and
heating the second water stream in a third evaporator to a temperature between 100° C. to 140° C., to produce a third heated water stream, wherein a volume of the third heated water stream is less than the volume of the separated water stream.
13 . The process of claim 12 , wherein each of the first, second, and third evaporators produces steam during heating.
14 . The process of claim 2 , further comprising:
separating the cooled product stream by supplying the cooled product stream to at least one decanter configured to separate a treated feedstock and a product water stream;
recycling the product water stream back into the pretreated feedstock prior to pressurization, wherein the first water stream is at least partially comprising the recycled product water stream.
15 . A process for treating a feedstock comprising:
combining the feedstock with a first water stream, creating a feedstock and water stream;
injecting steam directly into the feedstock and water stream, forming a heated feedstock and water stream,
wherein the mass ratio of steam to the heated feedstock and water stream is between about 0.1:10 and 10:0.1;
producing a cooled product stream;
separating the cooled product stream by supplying the cooled product stream to at least one decanter configured to separate a treated feedstock and at least one product water stream; and
recycling the at least one product water stream into the first water stream, wherein the first water stream is at least partially comprising the recycled product water stream.
16 . The process of claim 15 , further comprising maintaining the heated feedstock and water stream at a laminar flow for a time.
17 . The process of claim 15 , further comprising pretreating the feedstock using a degumming process before the step of combining the feedstock with the first water stream.
18 . The process of claim 15 , further comprising pre-heating the feedstock to a temperature of from 150° C. to 300° C., inclusive, prior to steam injection.
19 . The process of claim 15 , further comprising enzymatic degumming, water degumming, or a combination thereof, before the step of injecting steam.
20 . The process of claim 17 , wherein the separating step comprises gravimetric separation.
21 . The process of claim 16 , wherein the maintaining step comprises providing the heated feedstock and water stream to a reactor,
wherein the laminar flow has a Reynolds number of less than 2000.
22 . The process of claim 16 , wherein the maintaining step comprises providing the heated feedstock and water stream to a pipe,
wherein the laminar flow has a Reynolds number of less than 2000.
23 . The process of claim 15 , wherein the feedstock comprises a petroleum-based feedstock or a renewable feedstock, and a contaminant.
24 . The process of claim 23 , wherein the renewable feedstock comprises a glyceride-based lipid.
25 . The process of claim 17 , wherein the treated feedstock comprises less than or equal to 2 ppm of a metal contaminant.
26 . The process of claim 17 , wherein the treated feedstock comprises chlorophyll in a total amount of about 30 to 50 ppb chlorophyll or 15 to 30 ppb chlorophyll, inclusive.
27 . The process of claim 15 , wherein the feedstock has a pressure of from 3 to 10 MPa; and wherein the steam has a pressure of from 3 to 10 MPa.
28 . The process of claim 15 , wherein the steam injection step heats the feedstock to a temperature above 200° C.
29 . The process of claim 15 , wherein the laminar flow has a Reynolds number of 1000 to 1999 or 500 to 1000, inclusive.
30 . The process of claim 15 , wherein the time is from 30 to 60 seconds, 5 seconds to 5 minutes, 1 to 3 minutes inclusive.
31 . The process of claim 15 , wherein separating the cooled product stream by supplying the cooled product stream to at least one decanter comprises:
i) providing the cooled product stream to a first decanter;
ii) separating a first high-pressure water stream from a first feedstock product stream;
wherein the first high-pressure water stream is at a pressure of 3 MPa or greater;
iii) providing the first high-pressure water stream to a first flow control valve to produce a first product water stream of the at least one product water stream;
iv) providing the first feedstock product stream to a second decanter;
v) separating a second pressure water stream from the treated feedstock;
wherein the second pressure water stream is at a pressure of 0.5 MPa or greater;
vi) providing the second pressure water stream to a second flow control valve to produce a second product water stream of the at least one product water stream.
32 . The process of claim 31 , further comprising:
vii) supplying the first high-pressure water stream to a flash tank configured to heat the first high-pressure water stream and produce steam and a third high-pressure water stream;
viii) combining the third high-pressure water stream with the second pressure water stream such that the third high-pressure water stream fully combines with the second pressure water stream before the step of providing the second pressure water stream to the second flow control valve.
33 . The process of claim 31 , further comprising heating the second pressure water stream in a multi-effect evaporator to produce steam and a cleaned discharge water stream.