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How to use the Seplite catalyst resin CT101?

3.1 Prerequisites for resin catalyst loading

- The whole system must be cleaned, degreased, blown and meets all quality requirements.

- The container in contact with the catalysts must be dedusted and derusted.

Note: Only after the above procedures are completed can the catalyst loading start.

3.2 Attention should be paid to the following in the loading process.

- Loading is forbidden in rainy and snowy days.

- Loading is forbidden in sandy days.

- Loading is forbidden if the cleaning is not conducted or not thoroughly conducted.

3.3 Loading of bulk resin catalysts

3.3.1. Installation of the reactor catalyst-supporting stainless steel mesh

The support grids supporting the resin catalysts are generally processed by the equipment manufacturer into a square-shaped combination. Before loading the catalyst, each square grid must be fixed with three layers of stainless steel mesh. The upper and lower layers are 20 mesh, and the middle layer is 80 mesh. (The actual situation is subject to the design of the design institute), the stainless steel mesh must be made of titanium-containing material. 0Cr18Ni9Ti, 0Cr18Ni10Ti, 0Cr18Ni11Ti can be used. The stainless steel mesh is compacted with stainless steel flat steel and fixed on the square grid with stainless steel screws. The gaps between the grids and the grids and the reactor must be filled with asbestos tapes with a width of about 6mm or 80-mesh stainless steel mesh and tamped with a flat shovel and a hammer. There should be no gaps to avoid catalyst leakage.

3.3.2. Loading of inert ceramic balls

After the catalyst support grid is installed according to the above step, a 100-150mm thick ¢2-4mm inert ceramic ball should be placed on it. The ceramic ball must be cleaned without dust on the surface. It is best to soak it in 5-10% hydrochloric acid for 24 hours in advance, then wash it with pure water until it is neutral, and then load it into the reactor and spread it out.

3.3.3. Loading of bulk resin catalysts

1) Be careful not to put the certificate, inner bag, rope and other sundries into the reactor.

2) The catalysts cannot be rinsed with non-desalinated water.

3) The catalysts scattered on the ground and mixed with mud, sand, rust and other debris are not allowed to be loaded into the reactor.

4) After the catalysts are loaded into the reactor, it must be soaked in methanol immediately. The time of the water-containing wet resins in the reactor should not exceed 48 hours. If the methanol soaking conditions are immature, catalyst loading into the reactor should be delayed.

5) The catalysts are strictly prohibited from contacting metal and non-desalinated water.

6) Operators and installation personnel should strictly abide by the safety regulations. Blind plates should be added to the flanges connected to the nitrogen lines to prevent suffocation and injury in the reactor.

7) All kinds of tools entering the reactor must be washed with softened water, and metal tools must not be in contact with the catalysts.

8) The catalysts are loaded into the reactor from the inlet. The upper surface should be flattened after reaching the predetermined height.

9) Seal up and test for tightness. Get ready for Pretreatment.

3.4 Instructions for Use of the catalysts

3.4.1 Pretreatment scheme of resin catalysts

- The resin catalysts have been already washed with pure water before leaving the factory, and do not need to be washed again with water after being loaded into the reactor. There is no harm if the user wants to wash the catalysts again, however if they are to be washed again, they must be washed with demineralized water. Softened water must not be used for washing.

- There are hydrophilic sulfonic acid groups in the resin catalysts, so they must be stored in a water-containing state, and need to be pretreated with methanol before use. Taking advantage of the mutual solubility of methanol and water, according to the principle of concentration action, methanol and water can form a methanol-water solution with a certain concentration, so that the water contained in the resin catalyst can be taken out of the reaction system. Methanol fills the reactor from the pretreatment line or the process line and can be left to soak (slightly longer) or establish a dynamic circulation with the methanol tundish. The time of methanol pretreatment is generally 12~24 hours (minimum not less than 6~8 hours), and the final concentration of methanol treatment solution is preferably 80~85%.

- Use nitrogen to exhaust the methanol to the recovery tower for recovery, and the catalyst pretreatment in the reactor is completed.

4.A brief introduction to chemistry catalysis

Catalysis is the acceleration of a chemical reaction by a substance that is not consumed itself. When a chemical is placed with a compatible catalyst, there is a reduction in the energy required for the chemical to reach the transition state for that particular reaction.

Typically on the basis of nature and the physical state of substance used in the chemical reaction, chemical catalysis can be divided into three types; Homogeneous catalysis, Heterogeneous catalysis, and Autocatalysis.

Homogeneous catalysis is a type of catalysis in which the catalyst operates in the same phase as the reactants — usually dissolved in a solvent. Mechanistic studies of homogeneous catalysts are generally easier than those of heterogeneous catalysts, which aids optimization.

Heterogeneous catalysis, on the other hand, is catalysis where the phase of catalysts differs from that of the reactants or products.

A single chemical reaction is called autocatalytic if one of the reaction products is also a catalyst for the same or a coupled reaction. Such a reaction is called an autocatalytic reaction.

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