Best answer: What is recycle ratio in chemical engineering?

A recycle ratio is a profitability ratio that measures the profit per barrel of oil to the cost of finding and developing that barrel of oil.

What is recycle in chemical engineering?

Recycling is the act of taking one stream in a process and reusing it in an earlier part of the process rather than discarding it.

What is the recycle ratio in wastewater?

Recycle ratios are typically between 1 and 20 with the total particulate flow through the boiler limited to between 2 and 3 times the fly ash flow.

What is the difference between recycle and bypass?

Recycle stream is a term denoting a process stream that returns material from downstream of a process unit back to the process unit. Bypass stream is a stream that skips one or more stages of the process and goes directly to another downstream stage.

What is recycle and purge?

Recycle and purge streams are an extension of splitter streams, whereby one of the product streams from the splitter is routed back into a previous process as a recycle stream and one is directed out of the process as a purge stream.

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What is purge ratio?

A purge ratio is the ratio of the volume of hydrogen in the purged gas to the volume of hydrogen in the makeup gas. Purging is required to prevent the buildup of inert gases and light hydrocarbons in the recycle gas. The quantity of purge directly influences the purity of the hydrogen in the recycle gas.

How do you calculate recycling?

When we study recycle systems, we are often asked to calculate the recycle ratio. Usually, this is found by dividing the mass flow of the recycle stream by the mass flow of the “fresh feed” entering the system.

What is sludge recycle ratio?

The sludge recycle ratios in the range from 0.3 to 1 were consi- dered. The COD removal, SVI and DO were determined and the optimal va- lues were obtained. It was observed that at HRT of 16 h and the sludge recycle ratio of 0.85, the COD removal and SVI were 95 and 85 %, respectively.

What is recycle reactor?

Recycle reactors are used when the reaction is autocatalytic, or when it is necessary to maintain nearly isothermal operation of the reactor or to promote a certain selectivity (see Section 5.6. … We shall define the recycle parameter R as the moles recycled per mole of product removed at point Q.

What is sludge recirculation ratio?

Sludge Recirculation Ratio (r).

It is the ratio of return sludge to sewage flow. It is also called return sludge ratio. Return sludge ratio = Qr/Q = Vs/ (1000-Vs)

Does recycle increase conversion?

There are several reasons one might employ a recycle stream: increase conversion of a reactant to product. recovery of catalyst. dilution of a process stream (either to improve flow of the stream or control the rate of a reaction)

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Why bypass is used in chemical industry?

If a reaction releases a large amount of heat it makes the reactor hard and expensive to control thus the concentration of the fed stream can the lowered by diluting the stream with a bypass stream that acts as capacitance for the heat transfer. Thus lowering the temperature of the stream.

What is tie component?

an element or material that passes unchanged in amount. from the reactants to the products—a tie element. Such a tie element is the calcium in a limestone being. calcined to lime and converted to a lime product, or the. ash in a coal which is coked or burned to form a refuse.

What is material balance equation?

The material-balance equation is the simplest expression of the conservation of mass in a reservoir. The equation mathematically defines the different producing mechanisms and effectively relates the reservoir fluid and rock expansion to the subsequent fluid withdrawal.

What is Singlepass conversion?

Single-Pass Conversion = reactant input to reactor – reactant output from reactor. reactant input to reactor. ×100%

Why dont we use volume balance in a chemical process?

Explanation: Volume is not conserved in a process because different materials have different densities. 4. In the given tank, there are two feeds and one output. … In a process, two feed streams are there and one output stream.