Relationship between conversion rate and yield

Literally speaking, even if you succeed in the conversion, you may not be able to recover everything!

Generally speaking, the conversion rate multiplied by selectivity equals the yield. However, if the unreacted feed is recycled without separation losses, the yield is actually equal to the selectivity. Therefore, it is necessary to strike a balance between conversion rate and selectivity in order to find the optimal point of efficiency – that is, an appropriate conversion rate that yields high yields without requiring extremely high separation cycle costs.

Conversion rate X = amount of a certain reactant that has been converted / initial amount of that reactant; yield Y = amount of the key component used to produce the desired product / initial amount of that key component; selectivity S = amount of the key component used to produce the desired product / amount of the key component that has been converted; Y = XS

Conversion rate = Amount of reactant that has been converted / Total amount of reactant * 100% 1: The ratio of the reaction rates of various substances in a chemical equation is equal to their stoichiometric coefficients. 2: The reaction rates of all substances in a chemical equation represent the same rate of chemical reaction. The conversion rate generally refers to the chemical conversion rate; it is the mass of a substance that participates in the reaction divided by the total mass of that substance. Yield, on the other hand, is the percentage of the desired product obtained, calculated based on the amount of reactants used. It is expressed as a mass percentage or a volume percentage. 　　That is, yield = (amount of target product produced / initial amount of key component) × 100%. 　　The relationship between yield, conversion, and selectivity is: yield = conversion × selectivity. 　　The percentage of the reactant material that is converted into the desired product in a single pass through the catalyst bed is called the single-pass yield. It is often used to measure catalyst activity. 　　The actual yield of a certain product is the percentage of the theoretical yield of that product, calculated based on complete reaction of a certain reactant added.

The conversion rate multiplied by selectivity gives the yield of the product

1. The conversion rate refers to the percentage or fraction of a given reactant that has been converted, that is, x = amount of the reactant that has been converted / initial amount of that reactant； Yield refers to the ratio of the actual amount of product produced from a given quantity of raw material in a chemical reaction or related chemical industrial process, to the theoretical amount of product that could be produced. 2. The conversion rate is relative to the starting material, while the yield is relative to the product. 3. Yield is related to selectivity, whereas conversion is not related to selectivity.

Yield equals conversion rate multiplied by selectivity

To understand the relationship between conversion rate and yield, it is first necessary to comprehend the concepts of conversion rate, selectivity, and yield. These are defined as follows: 1. Conversion rate The conversion rate is an indicator of the extent to which the reactants have reacted. It is defined as the percentage of a reactant (A) that participates in the reaction, relative to the amount added. 2. Selectivity: Selectivity is an indicator of how much of the reactants involved in the reaction are converted into the desired product. The percentage of the actual yield of a product relative to the theoretical yield (calculated based on the amount of a particular reactant that participates in the reaction). In other words, it is the percentage of a certain reactant consumed to produce the desired product, relative to the total amount of that reactant that participates in the reaction. 3. Yield The yield is a comprehensive indicator that shows how much of the reactants participated in the chemical reaction and how much was involved in the main reaction. The so-called yield refers to the percentage of the actual amount produced of a certain product, compared to its theoretical yield (calculated based on the amount of that reactant used). In other words, it is the percentage of the amount of a certain reactant consumed to produce the desired product, relative to the amount of that reactant added. Yield = Selectivity × Conversion rate

It seems that conversion rate, selectivity, and yield are all related to changes in the amount of reactants. Why are the quality and molar yield different? ? ?