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$����C�R���"���V)Y��/*��[�y�UD���S��@/T ����ɂ�{}_�v]�Y���+2~_ݦ���Li���V�pk It is also very poorly soluble in water. 7��w0[-��d���$�x��&.�4��'٬w��I6��x����h�gj�̰���y��r#3ԣi����SF �P����8*%%� c�/���/h�u�wˋ�Q�3�Y�7�����: Higher values of storage module determined for the compounds showed higher mechanical resistance of compounds in comparison with the coal-tar pitch. Viscosity of the pitch, in assumed measuring conditions, was at first significantly decreasing until achieving minimum value, and then was increasing up to reaching a constant value, which situation implied occurrence of re-solidification process. Tests of rheological properties in oscillation mode with frequency sweep were carried out in order to confirm changes in colloidal structure of bitumen.

Measurements were taken using parallel plates fixture (plate radius 25 mm; gap between the plates 1 mm). Measurements versus temperature were taken by rising the temperature in increments of 5 °C min−1, at frequency of 1 Hz and deformation of 0.5%. [19]. The group composition is primarily responsible for the technological properties of pitch such as softening temperature, dynamic viscosity, fluidity at a specific temperature, coking property, and the yield of coke residue. Testing was aimed at the evaluation of thermal and rheological properties of coal-tar pitch modified with phenol-formaldehyde resin and indication of possible application(s) of such type of materials. %PDF-1.4 %���� The terms tar and pitch are often used interchangeably. The O2 containing heterocycles/furans in coal tar pitch includes dibenzofuran. The compound containing 50% of modifying agent by mass demonstrated higher ability of energy dissipation at frequencies up to 1 Hz (Fig. At room temperature, tar pitch flows at a very low rate, taking several years to form a single drop. We use cookies to help provide and enhance our service and tailor content and ads. In the case of coal raw materials, e.g. Methods of preparation and properties of mineral-carbon sorbents obtained from coal-tar pitch-polymer compositions. ����k�oߵ����S�������o��`�w��>>x��>"|'�樻.�x-�ks�x]�����x{}������6��� ���h���>���n�?��A������i��?�����6 >ض����������"��x������?��{����������w~�ǿt��|^�����s��ע� �����=���o{x����G�?�7|}2�'����hL�\�i��'�Iz����۞�6Y�������&��~��d�EU�g_�-?ЏipMufy��`dꡜԿ��rY�|::�m[ga��F?L��l*0�� �H+ �2�w��[R�����G�����G&�C��|H���$;������V���/�H�(#�O�RB�*ʦQ1��*Z�7W�A`�N�y0��M�볂�d�;:/+Box5���E^��6B/$�D*��m0˓\����(=W�� ��*�&U�� ��@s,�sA ��R�f&�����QJd'4B+ �'��\W/� R�IY���[eS^Y�9g��}P�����k Tests were performed for compounds containing 25% of modifying agent by mass, which undergo crosslinking for 0.5–2.0 h, at temperature 160 °C. Tests were carried out using the rheometer in oscillation mode. Such possibilities are provided by modification of coal bitumen with polymers [1,2,3], among others. Coal tar pitch is non-explosive and non-oxidizing in nature. Time of the order of decades is required for a value of the viscosity of a coal tar pitch to be obtained in this way. Exposure to coal tar pitch is primarily limited to occupational settings, such as tar distillation, roofing and aluminum smelting. Dependences of complex viscosity (|η*|) versus frequency determined at temperature 118 °C for compound of the pitch with 25% of phenol-formaldehyde resin by mass: open square—pitch/25PF/0; open rhombus—pitch/25PF/0.5; open triangle—pitch/25PF/1.0, Dependences of phase angle versus frequency determined at temperature 118 °C for compound of the pitch with 25% of phenol-formaldehyde resin by mass: open square—pitch/25PF/0; open rhombus—pitch/25PF/0.5; open triangle—pitch/25PF/1.0, Dependences of loss tangent versus frequency determined at temperature 118 °C for compound of the pitch with 25% of phenol-formaldehyde resin by mass: open square—pitch/25PF/0; open rhombus—pitch/25PF/0.5; open triangle—pitch/25PF/1.0. In: International Conference on Coal Science and Technology. Faculty of Civil Engineering, Mechanics and Petrochemistry, Institute of Chemistry, Warsaw University of Technology, Lukasiewicza 17, 09-400, Plock, Poland, You can also search for this author in It is often supplied to customers via rail in either tanker cars (liquid pitch) or hopper cars (solid pitch). T� �7�h�[FGGG�`��c0i IF W�$ d#8 epRPfH!�5i30���b@, ��:� C1�$��{�>0� E�2˱W1�a�˨ǐ=�=�j� CHEMICAL PRODUCT AND COMPANY IDENTIFICATION PRODUCT NAME: COAL TAR ROOFING PITCH OTHER/GENERIC NAMES: Roofing Pitch Changes in properties of coal-tar pitch under the influence of phenol-formaldehyde resin were evaluated on the basis of: softening temperature (T Reaction of such type could probably lead to the partial crosslinking of resin added to pitch and the change in bitumen properties. Medicinally it is a topical medication applied to skin to treat psoriasis and seborrheic dermatitis (dandruff). Creosote oil Dead oil Call fire department. The temperature relationship of complex viscosity determined for coal-tar pitch implied similar behaviour of the pitch like polymers and thermosetting resins. Polimery. Similarly like at the evaluation of the impact of phenol-formaldehyde resin amount, also at the evaluation of the impact of crosslinking time the measurements were taken at possibly lowest temperature which minimized further crosslinking of resin. Tar bases/N2 containing heterocycles in coal tar pitch include acridine, and carbazole. Polimery. 4). Determination of the effects caused by different polymers on coal fluidity during carbonization using high-temperature 1H NMR and rheometry. It can prove a difference between relaxation times of tested coal-tar pitch and composition. J Therm Anal Calorim. 2012;107:893–900. 7, 8). 0000098033 00000 n doi:10.1007/s10973-017-6103-0. 5, 6). 2), it was found that the compounds which did not undergo crosslinking demonstrated higher viscosity in comparison with the coal-tar pitch in the whole frequency range at temperature 109 °C. [17]. softening temperature, temperature of achievement of minimum complex viscosity and re-solidification temperature. Coal tar pitch is currently produced from coal tar, which is a byproduct of high temperature coking of coal in the manufacture of metallurgical coke. Together with both increase in resin addition and extension of crosslinking time, changes in evaluated properties became more intense. It probably results from the increased content of components of higher average molecular mass in the pitch and lower solubility in organic solvents. content of insoluble constituents in quinoline (QI) as per PN-C-97058:1999 standard. To conclude, addition of phenol-formaldehyde resin to coal-tar pitch caused the increase in softening temperature, content of components insoluble in quinoline, value of complex viscosity and storage and loss modulus. � G.?e\G�@��|%j�ИTBK�Qe4�yv �T73�,��3=�5�В��9���+�dy�~�i,�� �QT�H� Upon distillation, 8 % to 12 % of a naphthalene fraction, 5 % to 9 % of an absorption fraction, and 21 % to 26 % of an anthracene fraction, which boiled away to 360 deg ?, are separated. Tests were conducted in oscillation mode by determining dependences of storage and loss modules, complex viscosity, phase angle versus frequency (0.001–50 Hz) and temperature (90–320 °C). �(�/D�L��(WK^�q�,���e����3]�����%�5�8(|��cH"�|[Z���iR�T(��(�q��$�%IoB�(�8R��mއ⾞�����o@�5�,���S�7��LmJ_r* ,���C'�� �t8��쫈 Runs of individual dependencies for all compared compounds containing 25% of resin by mass were similar.

It is the shiny, dark-brown to black residue produced by distillation of coal tar. It implied the occurrence of chemical reactions leading to formation of components of probably substantial molecular masses, as a result of crosslinking, among others. stream This is since oxygen (O2) promotes the formation of free radicals which favour polymerization reactions. Such trend of property changes can point at the change in colloidal structure of bitumen under influence of resin, which probably results from interactions between components of the coal-tar pitch and phenol-formaldehyde resin at the stage of homogenization of components at temperature 160 °C and the probable formation of components of lower solubility in organic solvents. Constituents and conditions of the preparation of individual compositions are presented in Table 1. Fuel. 2012;109:767–72. �꒰�: ���Q����eT It is used to make Cutler's resin.

In the case of compounds, intersection point moved towards lower frequencies together with increase in modifying agent content. Test results of changing the thermo-rheological properties of coal-tar pitch under influence of phenol-formaldehyde resin are presented in this research work. 1996;75:1543–8. The applicability of three equation forms to these results has been assessed. 0000048325 00000 n

Coal tar pitch contains a large number of substances. The possibility of further crosslinking of the resin at measurement conditions was also minimized in the case of that compound. 2017;128:1463–78. Various forms of pitch may also be called tar, bitumen, or asphalt. 3, 4) show small differences of viscoelastic properties of coal-tar pitch and the compound containing 25% of phenol-formaldehyde resin by mass. Coal Tar Pitch and Asphalt Cutbacks:-These refined coal tar pitches and asphalts are cutback in various solvent to give a wide range of viscosities. J Therm Anal Calorim.

Extension of crosslinking time also caused shifting of intersection point of G′, G″ = f(ν) curves towards lower frequencies (Table 2).

Ciesińska W. The rheological properties of coal bitumens modified by polyesters.

Minimum 25% of phenol-formaldehyde resin by mass added to the pitch caused distinct changes in main physical and chemical properties in relation to unmodified pitch [11, 12]. 0000003752 00000 n

3).

It was decided to measure the changes in viscoelastic properties versus frequency of coal-tar pitch and pitch–phenol-formaldehyde resin compounds (without crosslinking) at as low as possible temperature (109 °C) which reduces to minimum the possibility of crosslinking reaction during measurement.

Coal tar pitch that is released or disposed in the environment is likely to remain unchanged for many years. The plots of phase angle (δ) versus frequency, determined at temperature 109 °C for coal-tar pitch and compounds of the coal-tar pitch with phenol-formaldehyde resin (without crosslinking): open circle—pitch, open square—pitch/25PF/0, open triangle—pitch/50PF/0, The plots of loss tangent (tg δ) versus frequency, determined at temperature 109 °C for coal-tar pitch and compounds of the coal-tar pitch with phenol-formaldehyde resin (without crosslinking): open circle—pitch, open square—pitch/25PF/0, open triangle—pitch/50PF/0. In the range of lower frequencies, values of both modules became equal. coals subjected to high-temperature carbonizing process in order to obtain porous materials, it is essential to assure high flowability (low viscosity) at carbonizing conditions as well as appropriate mechanical strength.

Coal tar pitch is a coal conversion product.

Coal tar pitch is an industrial product and is not sold directly to consumers or for direct consumer use. J Therm Anal Calorim. The surface to be polished is pressed into the pitch, then rubbed against the surface so formed. The use of waste poly(ethylene terephthalate) and phenol-formaldehyde resin for the preparation of activated carbons. High Viscosity Blended Bitumen Pitch,Coal Tar Pitch , Find Complete Details about High Viscosity Blended Bitumen Pitch,Coal Tar Pitch,High Viscosity Blended Bitumen Pitch from Bitumen Supplier or Manufacturer-Waterproof Materials Co., Ltd 0000004019 00000 n In use, the pitch is formed into a lap or polishing surface, which is charged with iron oxide (Jewelers' rouge) or cerium oxide. PL 189817 B1. Solid coal tar pitch is extruded into small rods and, for this reason, is often referred to as ‘pencil pitch’. Fuel. 1998;43:175–84.

Unfortunately, high content of cancerogenic aromatic compounds makes that they are acknowledged as the substances of high harmfulness.

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