CS221937B2 - Method of making the binder for the coal briquettes - Google Patents

Abstract

A binder for use in briquetting coal-containing material is obtained by disintegrating comminuted coal and/or similar carbonaceous raw material with a hydrocarbon mixture as solvent using elevated temperature and pressure conditions, distilling off between 5 and 20% of readily volatile fractions from the resultant high aromatic, coke oven pitch-like by-product to give a hard pitch-like product having a softening point (according to Kramer-Sarnow) of 120 to 200 DEG C, and adjusting the softening point to 50 to 100 DEG C with a hydrocarbon fraction boiling in the boiling point range 220 to 450 DEG C obtained from coal tar and/or by pyrolysis of petroleum fractions.

Description

BACKGROUND OF THE INVENTION The present invention relates to a process for preparing a binder for coal briquettes from a highly aromatic, pitch-like, valuable coal product.

Given the ever-decreasing oil reserves, natural gas will become increasingly important in the future. To heat the buildings for other heat supply purposes, the briquettes are expediently used.

In the minudoose, the binder used for the production of briquettes was mainly black-gray tar pitch. Coal tar pitch is obtained as tar residue as a thermoplastic product having a thermoplastic product temperature of 68 to ⁷⁵ ° C ⁽ cf. H.-G. Franck, G. Co ^o). Lin, SteinhoHenteer, Berlin Ί96Θ, p. 96). ^That is, the pitch is characterized by a yielding degree and can therefore be used as briquette pitch C to produce coal briquettes. A disadvantage of briquettes produced by coal tar pitch, however, is that they over-smoke during combustion. . Numerous attempts have therefore been made to lessen the pitch of coal tar by less pooiv.

As substitute products for coal tar pitch, my practical significance for the production of coal briquettes is primarily bium-based binder (cf. Zakar, Toth, Brennnsof Chemie, 32, 1958, p. 373). The briquettes that are produced using petroleum bitumen as a binder give less smoke, but my disadvantages with briquette pitch are the following: Biumene-based briquettes usually have a higher sulfur content and their combustion therefore results in a greater amount of sulfur dioxide from the combustion of pitch from the coal tar. In addition, due to the flatter course of the viscosity curve at biumene temperature, a longer cooling time of the briquettes after briquetting is required to give the briquette the necessary cold compressive strength. A further disadvantage of biumene-bonded briquettes is the low compressive strength of the insulation compared to pitch-bonded briquettes. Therefore, the combustion of briquettes in the stove is considerably disrupted, which has a disruptive effect on the efficiency and uniformity of combustion.

Another disadvantage is that in the future the long-term availability of bitumen is uncertain.

The binder described in German Offenlegungsschrift No. 2 708 495 does not have these disadvantages. The binder is obtained when hydrocarbon fractions obtained from coal tar or by pyrolysis of petroleum fractions are added to the hard pitch of black-coal tar to adjust its temperature in the range of ⁵⁰ and ^{1 00} ° C, preferably ⁶⁵ and ⁷⁵ ° C.

As the availability of hard coal tar pitch, which serves as a basis for the production of improved briquet pitch after DOS. No. 2,708,495, is limited for briquetting purposes, and there is a need for well-recognized pitches of coal tar which have, in addition, been characterized by low susceptibility for environmental reasons.

SUMMARY OF THE INVENTION It was therefore an object of the present invention to provide a briquetting binder which has good pitch pitch of black-gray tar and is characterized by the advantage of low wear and long-term availability.

This object is achieved according to the invention by a process for the production of feedstocks for coal briquettes and materials containing high-aromatic, pitch-like, valuable coal-based reactive materials prepared by the destruction of crushed coal and / or similar carbonaceous feedstocks with hydrocarbon mixtures as solvents at higher temperatures and pressures. · whose principle consists in that a product of similar pitch ždddetilžíe 5 to 20% by weight, of volatile poddlů until a ^P ro ^d i ^ L ^ iL · pždž ^b Nu creator pitch melting MANUT ¹²⁰ and ^M · ²⁰⁰ ° C by Kremer arnowa ^ ⁿ tery adjusted írEncemi hydrocarbon obtained from černošedého tar and / or oil in the pyrolysis treatment rain ation ^j 2 ^{0 2} ranging ^from 4 to ⁵⁰ ° C temperature and ⁵⁰ bend ^{in 100} ° C.

Preferably, the fraction of the carbohydrate fraction to adjust the desired temperature of the binder pitch is sent to the oil obtained in the black-gray tar distillation after separation of the crude anthracene by crystallization (cf. H.-G. Francky G. CoHin, Steinkohlenteer, Berlin 1958, p. 57). . The distillation range of these solvents is 300 to 460 ° C. Appropriate fractions of blend oils derived from the cracking or refining processes can also be used to adjust the desired softening temperature.

The types of coal that can be used to produce briquettes can vary widely. Thus it is possible; briquetting, for example, brown coal, bituminous coal and anracite.

[0018] In the briquetting process, the compositions produced according to the invention can be used to produce a comparatively good cold compressive strength such as coal tar pitch or binder obtained from hard coal bituminous pitch. a tar process according to DOS 2 708 495, which yields a sulfur greater than 2500 N under prescribed test conditions.

Surprisingly, however, it has been found that the binders produced according to the invention on the basis of agitated surfactants even have extremely low coefficients, and thus umoonuuuu combustion, not less environmentally friendly. A further advantage is also the much less odor nuisance at which the briquettes produced on the basis of agitated mine are characterized.

The production of pooiv is described in Examples 1 to 3. The production of highly aromatic products from uhH as starting pitch is the subject of an earlier patent application of the Federal Republic of Germany P 29 35 039.8. This is done by destroying the coal with a higher or lower content of volatile substances with the aromatic residues of the steam-pyrolysis of petroleum fractions in the mixture with aromatic mixtures, The mixture boils with an average boiling point above ³⁵⁰ ° C, as it is soluble in ^the additive ^, and ^further with the addition of other solvents. In order to adjust the desired copper temperature, the anthracene oil obtained during the anthracene treatment was used in the following examples (see H.-G. Franck, G. Cin. Steiokohlentrer, Bein 1968, p. 57). Examples 4 and 5 illustrate the advantages of the articles made according to the invention.

The table shows the curfew numbers of the articles made according to the invention in comparison with hitherto recommended carbon-based briquettes. The comparison with the conventional coal tar mixture as a binder results in a favorable curvature of the articles made according to the invention. For the determination of cold compressive strength and smoke numbers, cylindrical briquettes of 4 cm in diameter and 4 cm in height were prepared by the addition of 94.5 parts by weight of anionite (sieve analysis of 0 to 0.05 mm = 3% by weight). 0.05 to 0.2 mm = 17% by weight, 0.2 to 0.5 mm equal to 25% by weight, 0.5 to 2.0 mm = 55% by weight) are thoroughly mixed. with 5.5 parts of weight butan binders and sitoěi in nzidtovéo lssu ^p s at ¹ 5 ° C Hsují tlkkeo N4, ^{p 7} MPa for a period of ^{one second} of said briquette dimensions. The cold print strength is determined in the apparatus and in the determination of the compressive strength by measuring the force required to break the briquettes. ,

A suitable oerrophore method has been shown to determine the Kouuivoosi numbers. This method determines the turbidity opttoky centuries backwater stream ^P s temperature ⁶ ° C 0 ° sopouc ^. The method includes a description of the briquette coefficient

Example!

The method described in the earlier patent application of German P 29 35 039.8 produces a resin similar to the valuable one to be sold from the ule by destroying 30 parts by weight of steamy uils (We? TeruH, Poorui) with a mixture of 5 parts by weight; pitch deesilate; 35 parts by weight of pyrolysis residue. oil, 10 parts tar pitch of carbon black tar and 20 parts hmoo, pitch deesilate from the heat treatment of the black coal tar salt under pressure. Here, the mixture was reacted for ³ Todi ^ ^p ^ s rea the temperature of ³⁷⁰ ° ^C for ^3.6 oaaiméÍlníto Ua ^ M? A. ¹⁵ HIH Froot thus obtained Sool removed as a volatile component and 72 parts by mass of the resulting hard pitch melting me ^ n ^ i ^{of 145} ° C uproví ^P RID ^{NiO 28} says ^profiles ^ oto F ^L L ¹ roaoné ^h 1 lntracrnov ^é him oil at a temperature of 70 ° C. '

The non-melting point of the S1 is 1,843,247. The sulfur content is 1.25% by weight. The cold compressive strength is greater than 2,500 N.

Example 2.

Proceed as in. however, the following solvent mixture was used for disruption: 10 parts by weight. 20 parts by weight of the pitch, the residual pitch of petroleum pyrolysis (temperature is 88 ° C). 10 parts by weight pyrolysis oil from steam cracking of diesel. 13 parts by weight are removed from the snot so obtained. easily volatile components. The hard pitch having a softening point of 135 ° C was adjusted to ^{37 d} d toaot ^profiles. filtrovného ^eh of anthracene oil to ^me nntí 69 ° C. The nephelomeeric ^y number is 1 ⁶¹⁵ · 1 ² 50. Sulfur Sulfur Content

0.99% wt. The cold print strength is greater than 2,500 N.

Example 3,

The procedure is as in cases 1 and 2. 30 parts by weight are used as coal. (type 'stnstdor _J Saarland). The solvent mixture consists of 10 parts by weight. pitch of de-coal from heat treatment of pitch from coal tar under pressure. 30 parts by weight Oil from steam cracking oil and up to 10 parts steam. the residue of a petroleum gasoline cracking oil (mixing temperature 88 ° C). Removing 8 parts by weight. hard volatiles having a melting point of ³² ° C are obtained. The fourth is siooIv přidéíním ^{27 D} I ^profiles wt. ^l l f ^{t h} roviéé t ^ o anthracene oil adjusted to a temperature kiutií m ^ ⁷² ° C. .

The sulfur content is 0.67% by weight. The cold compressive strength is greater than 2,500 N.

Example 4 (Comparative Example) and ^J ^ ^to the briquetting means is merely the pitches ^y, melting měknvtií 70 filtroaiééht ant ^ ^^ affor oils and hard DOS 2708 ° ^{C. ANNUAL b} en ^Star from coal tar pitch as described ± 250th

495. nouUioosti number is 1520 and of IKL (Comparative Example) ^{In the} piers of the temperature tar Sernouhelněho OETO ^ i ⁷³ ° C. which is prepared ^by primaria. ^d ee ^with coal-coal tar ejection gives a number as a briquetting binder

Claims (3)

CLAIMS 1. A process for the manufacture of binders for coal briquettes and materials containing a high carbon fiber binder, a resin of a similar valuable value from the bins. by breaking up crushed clay and / or similar carbonaceous feedstocks with a mixture of hydrocarbons as a solvent at higher temperature and printing. o ^y signifying. 5% to 20% by weight of the resin-like product is separated. readily volatile constituents to a sell similar hard pitch having a softening point ^{of 120} and U ²⁰⁰ ° C according to Kramer-Sarnow, which is treated hydrocarbon fractions derived from ^at ernouheln ^eh of ^d ehtu and / or ^p yrolýzy ro ^{py d} estilačním range ^220-450 ° C to a temperature of ⁰ to 5 mětotrtí I ⁰⁰ ° C. 2. A process for the preparation of a briquette for coal briquettes according to claim 1, characterized in that from 8 to 15% by weight of readily volatile fractions are separated from the pitch-like valuable product from ul. 3. A process for the production of a briquette for coal briquettes according to items 1 and 2, characterized in that a pitch-like product of value. .of coal is sold by the destruction of coal or carbonaceous materials by aromatic steam pyrolysis residues. petroleum fractions in combination with mixtures of aromatics from coal having a mean boiling point above 350 ° C as a complementary solvent. ^{a case-to} ISAD s ^ ^ l ^ c ^ uštodel ¹ extended to a pressure of ^{3 * 5} MPa and temperatures MEEI ²⁵⁰ and ⁴²⁰ ° C.