Can transesterification be base catalyzed?

The transesterification reaction is base catalyzed. Any strong base capable of deprotonating the alcohol will do (e.g. NaOH, KOH, sodium methoxide, etc.), but the sodium and potassium hydroxides are often chosen for their cost. The presence of water causes undesirable base hydrolysis, so the reaction must be kept dry.

Is transesterification acid or base catalyzed?

Transesterification is a reversible reaction in which there is an exchange of the alkyl group of an ester with alkyl group of an alcohol as shown in Fig. 6.1 (Section 6.1), and can be catalyzed by an acid or base catalyst.

What is the first step in base catalyzed transesterification?

The first step involves the attack of the alkoxide ion to the carbonyl carbon of the triglyceride molecule, which results in the formation of a tetrahedral intermediate. The reaction of this intermediate with an alcohol produces the alkoxide ion in the second step.

Which catalyst is best for transesterification?

Nanosized CaO is an effective catalyst for transesterification of jatropha oil by a two-step process and has been observed to enhance biodiesel yield up to 98.54%.

What type of reaction is transesterification?

Transesterification is an organic reaction in which the R group of an alcohol is exchanged with an R’ group of an ester. This is generally done via the introduction of an acid or base catalyst to the reaction mixture. However, it can also be done using certain enzyme catalysts (such as lipases).

What are the catalysts that commonly used in the transesterification process?

Different solid-base catalysts used in transesterification include CaO, MgO, SrO, KNO3/Al2O3, K2CO3/Al2O3 [72, 73], KF/Al2O3, Li/CaO, KF/ZnO, basic hydrotalcite of Mg/Al, Li/Al, anion exchange resins and base zeolites [74, 75].

Is transesterification a type of esterification?

Transesterification is the modification of esters through chemical reactions. The main difference between esterification and transesterification is that esterification includes an ester as the end product whereas transesterification includes an ester as a reactant.

Which catalyst is used in transesterification?

The sulphonic-acid–modified mesostructured catalyst is used in the transesterification reaction, achieving a conversion as high as 100%. However, the high concentration of methanol has been found to be detrimental to the catalytic activity [99].

What is base catalysed reaction?

Base catalyzed: A process that is catalyzed by a base. No reaction. In the absence of strong acid or strong base, acetone and benzaldehyde do not react. In the presence of a strong base such as NaOH, acetone and benzaldehyde participate in an aldol condensation reaction.