6. Increase inhibiting properties of phenols by rectification

During the rectification process of total coke-chemical phenols (TCCPs), the isomers of diatomic phenols were concentrated in the distillation residue after monoatomic phenol separation (DRAMPS). Some samples of the DRAMPS product were taken from the operating "FCh-16" phenol inhibitor production utility of JSC "Angarsk Petrochemical Company" (APCC), and then pyrocatechine fractions were distilled (up to 300°C) from them. Their inhibiting properties were tested. The laboratory results served as a basis for the design of technical requirements for the prototype production of the inhibitor, and then technical regulations for the production were developed. The pilot butches of PCF inhibitor were produced on the plant utility. The composition of the laboratory and pilot plant samples was proved by chromato-mass spectrometry method, and they are presented in Table 4, and their quality factors in accordance with the State Standard demands are presented in Table 5.

Modified Byproduct of Coke Phenols as Effective and Prospective Inhibitors for Petrochemical Industry http://dx.doi.org/10.5772/66886 313


\*minor amounts of resorcin and its derivatives were identified by GLC-method together with pyrocatechine

Table 4. Compositions of DRAMPS and PCF, % mass.

(PCF), has been isolated. The fraction is analyzed and tested as polymerization inhibitor of industrial condensates for EP-300 utility of Angarsk Polymer Plant (APP) of "ROSNEFT" Joint-Stock Company, Irkutsk region, Russia [4]. Inhibiting activities of PCF and other inhibitors have been tested in accordance with the standard protocol of 8489-85 RU State Standard. The industrial samples of liquid pyrolysis products (pyrocondensates) of straight-run distillation of

The estimation of their inhibiting activities has been modeled under very closed conditions, or even under more hard conditions, than that for real-system "column-boiler" at the rectification process of pyrolysis semi-products, where the example is chosen from pyrocondensate of typical utility of "Ethylene/propylene-300" of APP, where production is benzene produced by

(1) Initiation of polymer formation in pyrocondensate by temperature impact with the addi-

(2) The amounts of the polymer formed products were detected by RU State Standard 8489-85

For this purpose, pyrocondensate of 100 cm<sup>3</sup> was loaded into a metal autoclave, and the inhibitor was added (or not added in blank experiment); the autoclave was sealed her-

Сblank

where Cinhib and Cblank are the amounts of experimental resins in pyrocondensates in

During the rectification process of total coke-chemical phenols (TCCPs), the isomers of diatomic phenols were concentrated in the distillation residue after monoatomic phenol separation (DRAMPS). Some samples of the DRAMPS product were taken from the operating "FCh-16" phenol inhibitor production utility of JSC "Angarsk Petrochemical Company" (APCC), and then pyrocatechine fractions were distilled (up to 300°C) from them. Their inhibiting properties were tested. The laboratory results served as a basis for the design of technical requirements for the prototype production of the inhibitor, and then technical regulations for the production were developed. The pilot butches of PCF inhibitor were produced on the plant utility. The composition of the laboratory and pilot plant samples was proved by chromato-mass spectrometry method, and they are presented in Table 4, and their quality

100% (6)

Laboratory experiment on modeling polymer formation has included the following:

metically and placed into a preliminary heated thermostat at 130°C for 1 h.

Effectiveness of inhibiting was estimated in accordance with the formula:

6. Increase inhibiting properties of phenols by rectification

factors in accordance with the State Standard demands are presented in Table 5.

Effectiveness <sup>¼</sup> <sup>С</sup>blank−Сinhib

gasoline and hydrocarbon gases have been used as investigation objects.

312 Phenolic Compounds - Natural Sources, Importance and Applications

hydrodealkylation.

tion of investigated inhibitor.

by the equipment "POS-77M."

inhibit and blank experiments, correspondingly.


Table 5. Quality factors of the "PCF" pilot batch.

The results of the laboratory investigations of different phenol samples are presented in Table 6.

Thus, it is shown that fine fractionating phenol mixtures to remove inactive monoatomic phenols allow to obtain special preparation of diatomic phenols "PCF," having its inhibiting activity close to the well-known individual and expensive preparation such as tert-butyl pyrocatechine (TBPC), belonged to sterically hindered phenols (SHPs).


Table 6. Effectiveness of inhibiting polymer formations for EP-300 pyrocondensates at the inhibitor consumption of 0.025 %.

The obtained PCF preparation was introduced into EP-300 production unit of Angarsk Polymer Plant of Petrochemical Company "ROSNEFT" and was employed for 2 years up to its runout in the company stocks.

The problem of utilization of CCP without the stage of power cost-based phenol vacuum fractionating has been arisen. But the problem is not unequivocal: its main disadvantages, for example, good water solubility and unpleasant organoleptic properties are not removed by this way of utilization, and in addition to that, the major part of overall (summarized) phenols (more than 2/3 of total amount) is not found in any application.
