JPWO2021028833A5

JPWO2021028833A5 -

Info

Publication number: JPWO2021028833A5
Application number: JP2022509075A
Authority: JP
Publication date: 2023-08-07

Description

Claims

A pretreatment process for removing impurities from a feedstock destined for subsequent hydrotreating and isomerization steps in a biofuel production plant, said pretreatment process comprising the steps of:
hydrolysis step (B);
water and glycerol treatment (F);
glycerol enrichment (J);
glycerol distillation (L);
acid esterification (G);
including
The feedstock comprises
a raw stream (1) consisting of an organic feedstock containing secondary raw materials , category 1 animal fats, residual oils or by-products consisting of monoglycerides, diglycerides, triglycerides and free fatty acids;
a recycle stream (25) comprising a mixture of monoglycerides, diglycerides and triglycerides from the esterification unit free of said impurities;
including both
said impurities consist of phosphorus, chlorides, calcium, magnesium and heavy metals present in ionic form;
Said feed (1, 25) is sent to said hydrolysis step (B), said hydrolysis being carried out with an excess of water under controlled pressure and temperature conditions, so that the incoming feed Partial or complete conversion of materials to glycerol and fatty acids is obtained, and the excess water introduced into the hydrolysis step acts as a solvent for the impurities present in ionic form, resulting in the incoming Most of the heavy metals and chlorides contained in the feed are removed to give a first effluent stream (3) consisting of fatty acids, having a phosphorus concentration of less than 3 ppm and calcium and magnesium concentrations of less than 3 ppm. A quantity of said first effluent stream (3) is sent to said esterification step (G) and the remainder of said effluent stream (3) is sent to said subsequent hydrogenation and isomerization steps. , water and glycerol, containing all said removed ions to obtain a pure glycerol stream (15) to be sent to said esterification step (G), said Said second effluent stream (9) is combined with said water and glycerol treatment (F), said glycerol enrichment to produce said recycle stream (25) which is to be combined with untreated stream (1). (J) and sent to subsequent purification steps of said glycerol distillation (L) .

A process according to claim 1, wherein the water sent to pretreatment is in the pressure range of 10 bar g to 60 bar g .

The process of claim 1, wherein the water sent to said pretreatment is in the temperature range of 150°C to 260°C.

The process of claim 1, wherein water is sent to said pretreatment in excess with a water/triglyceride ratio ranging from 0.1 to 1.

2. The process of claim 1, wherein said incoming feed reacts with water in said hydrolysis process according to the following reaction.

4. A stream of fatty acids free from components detrimental to subsequent processes is output from said pre-hydrolysis treatment while a stream consisting of glycerol, water and impurities is removed from the biofuel production line. 5. The process described in 5.

Said glycerol contained in the product from said pretreatment, concentrated by evaporation and purified by distillation, is combined with an amount of said glycerol and a portion of the product consisting of fatty acids from said pretreatment in an esterification unit. 7. The process of claim 6, wherein the remaining portion of the glycerol is marketed as is.

8. Process according to claim 7, characterized in that the product consisting of fatty acids and coming out of said pretreatment is wholly or partly sent to subsequent hydrogenation and isomerization steps to produce biofuels.

A steam stream resulting from the condensation of glycerol and thus free of impurities is condensed and sent to said hydrolysis process, enabling reduced utility consumption and complete recovery of water from the condensation plant. The process described in 7.

Apparatus for performing the process of claim 1 for hydrotreating and isomerization pretreatment processes in biofuel production plants to remove impurities consisting of phosphorus, chlorides, calcium, magnesium and heavy metals from select feedstocks. wherein the selected feedstock is
a raw stream consisting of an organic feedstock containing secondary ingredients such as frying oil, category 1 animal fats, residual oils, or by-products consisting of monoglycerides, diglycerides, triglycerides and free fatty acids;
a recycle stream exiting the esterification unit consisting of a mixture of clean mono-, di- and triglycerides;
in a device comprising both
The device comprises:
at least one pretreatment reactor in which the hydrolysis reaction of the incoming feedstock is carried out with water under controlled pressure and temperature conditions;
at least one hydrogenation reactor for treating the stream from said pretreatment comprising the resulting fatty acids;
at least one isomerization reactor for producing biofuel;
A scrubber for a stream of water and glycerol from hydrolysis, comprising at least one treatment with hydrochloric acid (HCl), at least one neutralization (with NaOH or CaO) and at least one filtration washer and
at least one evaporator for concentrating the glycerol-containing stream exiting the washer;
at least one distillation column for purifying glycerol exiting said evaporator;
reacting glycerol and fatty acids, suitable for receiving an excess of non-marketable purified glycerol from said distillation column and an amount of product consisting of fatty acids and exiting said pretreatment reactor; at least one esterification reactor for
equipment, including

6. A product obtained according to the process of claim 5, consisting of fatty acids and having a concentration of phosphorus of less than 3 ppm and a concentration of calcium and magnesium of less than 3 ppm, leaving said pretreatment. .