Esterification of free fatty acids using water-tolerable Amberlyst as a of heterogeneous acid catalysts, Amberlyst 15 and Amberlyst BD The grant supports Rohm and Haas’s development of a newly commercial polymeric catalyst technology, AMBERLYSTâ„¢ BD20 specialty. When the FFA contents of oils were and wt%, the activity of Amberlyst 15 gradually decreased with recycling, whereas the activity of Amberlyst BD

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A method for producing esters, comprising: However, heterogeneous esterification activity is generally less than with homogeneous catalysts, and multiple stages or extreme operating conditions are typically required to achieve acceptable conversions. Approximately g of feedstock was fed over What is claimed is: In another embodiment method is conducted in parallel with method Potential causes of this steady deactivation include catalyst fouling and deactivation by proteins, phospholipids, metal ions, neutralization, chemical compounds i.

In one embodiment, ambelyst WHSV is selected between 0. After a prescribed residence time and set of operating conditions the second reaction mixture exits the reactor with reduced free amberoyst acids and enters a separation stage.

A review of biodiesel production by integrated reactive separation technologies. Where methods and steps described above indicate certain events occurring in certain order, those of ordinary skill in the art will recognize that the ordering of certain steps may be modified and that such modifications are in accordance with the principles of the invention. The method amnerlyst claim 1wherein said homogenous catalyst prolongs the activity of said heterogeneous catalyst. Pressure is generally maintained at a constant level throughout the reaction.

Alcohol levels greater than 30 molar excess typically provide minimal benefit for first stage reactions, although in some embodiments greater than 30 molar excess may amberlyyst desirable.

Esterification of free fatty acids using water-tolerable Amberlyst as a heterogeneous catalyst.

In another embodiment, the residence time is between 5 and minutes. The method of claim 1further comprising the step of separating a majority of the alcohol and water from the reaction mixture to obtain a dry reaction mixture.


The calculated molar ratio of methanol to free fatty acids was 8. The FFA esterification reaction is affected by temperature, molar ratio of alcohol to FFA, mass transfer limitations, catalyst concentration, reaction time, and reaction stoichiometry.

The invention is illustrated in detail below with reference to the examples, but without restricting it to them.

Simultaneous synthesis and purification of a fatty acid monoester biodiesel fuel. The method of claim 1wherein said reactor is a fixed bed reactor. US USA1 en The present invention may be practiced by implementing process steps in different orders than as specifically set forth herein.

Homogenous catalysis amberkyst excellent selectivity and activity. Year of fee payment: The reaction should take place at an elevated temperature to improve reaction kinetics.

In one embodiment, operating conditions of unit are selected to minimize the amount of homogenous catalyst in stream 6 thereby maximizing the amount of the homogenous catalyst in stream 7. Amberkyst invention converts free fatty acids into esters by esterification with alcohol and a dual catalyst such that the reaction mixture contains sufficiently low free fatty acids and the amount ajberlyst free fatty acids in the product stream leaving the process remains stable over time.

In one embodiment the FFA content of the reaction mixture is maintained at a sufficiently low level to enter a catalytic transesterification or hydrotreating process without requiring an intermediate FFA removal step. In one embodiment, alcohol and water and other volatiles 11 are removed from the second reaction mixture 10 contained in unit by distillation amverlyst a dry reaction mixture 12 and a portion of homogenous catalyst.

Method for producing alkyl carboxylates by multi-stage esteridication interrupted with a dehydration step. In one embodiment, the homogenous catalyst described in the invention is methanesulfonic acid MSA. In one embodiment the oil phase is sufficiently dry, free of water, alcohol and homogenous catalyst before entering a transesterification process or a crude biodiesel purification process. Purification technologies for crude biodiesel obtained by alkali-catalyzed transesterification.


Rohm and Haas releases new technology

Dotted lines within the figures are representative of optional process streams which may be included as part of the process. Process for the preparation of meth acrylate esters and polyester meth acrylates using microwave energy as a heating source.

US USB2 en The method of claim 1wherein the combination of said homogeneous catalyst and said heterogeneous catalyst provide increased conversion relative to the use of either catalyst alone. The regeneration may be performed in multiple steps with different acid concentrations and residence times in each step.

Additional homogenous catalyst is optionally added with alcohol 4 to the second reactor However, catalyst regeneration requires capital and operating expenditures for additional process units and typically cannot recover the initial level of activity. A dual catalyst process can also reduce the continuous operating expense of using unrecoverable homogeneous catalysts by reducing the amount of homogeneous catalyst required to obtain the advantages of homogeneous catalyst use.

In one embodiment it may be beneficial to minimize the amount of homogenous catalyst in stream In another embodiment method is repeated in amberlydt with method The method of claim 1zmberlyst said heterogeneous catalyst is an ion exchange resin catalyst.


The reactor contains a predetermined amount of heterogeneous catalyst. This equates to a liquid hourly space velocity of 2. Therefore, in one embodiment of this invention, the final FFA content of the reaction mixture leaving the process during steady state operation remains stable over time, that is, the final FFA content does not consecutively increase or decrease ambrrlyst as to create a trend.