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<h1 id="firstHeading" class="firstHeading mw-first-heading"><span class="mw-page-title-main">Walter Weldon</span></h1>
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<p><b>Walter Weldon</b> (* <a href="31._Oktober" title="31. Oktober">31. Oktober</a> <a href="1832" title="1832">1832</a> in <a href="Loughborough" title="Loughborough">Loughborough</a>; † <a href="20._September" title="20. September">20. September</a> <a href="1885" title="1885">1885</a> in Burstow) war ein englischer <a href="Chemie" title="Chemie">Chemiker</a> sowie <a href="Journalist" title="Journalist">Journalist</a> und <a href="Publizist" title="Publizist">Publizist</a>. Sein zweiter Sohn war <a href="Walter_Frank_Raphael_Weldon" title="Walter Frank Raphael Weldon">Walter Frank Raphael Weldon</a>, ein englischer <a href="Zoologie" title="Zoologie">Zoologe</a> und <a href="Biostatistik" title="Biostatistik">Biometriker</a>.
</p>

<div class="mw-heading mw-heading2"><h2 id="Leben_und_Werk">Leben und Werk</h2></div>
<p>Walter Weldon entwickelte ein Verfahren, um das bei der <a href="Chlor" title="Chlor">Chlorgewinnung</a> aus <a href="Chlorwasserstoff" title="Chlorwasserstoff">Chlorwasserstoff</a> und <a href="Braunsteine" class="mw-redirect" title="Braunsteine">Braunstein</a> entstehende <a href="Mangan(II)-chlorid" title="Mangan(II)-chlorid">Mangan(II)-chlorid</a> zurück in Braunstein umzuwandeln. Das nach ihm benannte <i>Weldon-Verfahren</i> wurde erst durch das <a href="Deacon-Verfahren" title="Deacon-Verfahren">Deacon-Verfahren</a> und später durch die <a href="Elektrochemie" title="Elektrochemie">elektrolytische</a> Gewinnung von Chlor durch <a href="Chloralkalielektrolyse" class="mw-redirect" title="Chloralkalielektrolyse">Chloralkalielektrolyse</a> ersetzt.
</p><p>1854 begann er als Journalist in London beim <i>The Dial</i>, der später vom <i><a href="Morning_Star" title="Morning Star">The Morning Star</a></i> übernommen wurde. 1860 gab er das Monatsmagazin <i>Weldon's Register of Facts and Occurrences relating to Literature, the Sciences and the Arts</i> heraus. Er gab auch die Zeitschriften <i>Weldon's Fashion Journal</i>, <i>Weldon's Patterns</i> und <i>Weldon's Household Encyclopaedia</i> heraus. Er gab auch in den späten 1800ern Strickanleitungen über Weldon &amp; Company heraus. Um 1888 erschien <i>Weldon’s Practical Needlework</i> und <i>Weldon's Ladies' Journal</i> (1875–1954).
</p><p>1877 wurde er zum Mitglied (<a href="Fellow" title="Fellow">Fellow</a>) der <a href="Royal_Society_of_Edinburgh" title="Royal Society of Edinburgh">Royal Society of Edinburgh</a> gewählt.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup>
</p>
<div class="mw-heading mw-heading2"><h2 id="Weldon-Verfahren">Weldon-Verfahren</h2></div>
<p>Im ersten Schritt reagiert Mangandioxid mit Salzsäure unter Chlorentwicklung zu Mangan(II)-chlorid:
</p>
<dl><dd><span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \mathrm {MnO_{2}+4\ HCl\longrightarrow MnCl_{2}+Cl_{2}+2\ H_{2}O} }">
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<annotation encoding="application/x-tex">{\displaystyle \mathrm {MnO_{2}+4\ HCl\longrightarrow MnCl_{2}+Cl_{2}+2\ H_{2}O} }</annotation>
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</math></span><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/ee8c362701a9b620d3c3caf6a7639ce01b629df1.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:42.244ex; height:2.509ex;" alt="{\displaystyle \mathrm {MnO_{2}+4\ HCl\longrightarrow MnCl_{2}+Cl_{2}+2\ H_{2}O} }" loading="lazy"></span></dd></dl>
<p>Das entstehende Mangan(II)-chlorid wird mit Kalkwasser versetzt und unter Luftzutritt entsteht Calciummanganit, das wieder in den Prozess zurückgeführt werden kann:
</p>
<dl><dd><span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \mathrm {2\ MnCl_{2}+3\ Ca(OH)_{2}+O_{2}\rightarrow CaO\cdot 2\ MnO_{2}+3\ H_{2}O+2\ CaCl_{2}} }">
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<annotation encoding="application/x-tex">{\displaystyle \mathrm {2\ MnCl_{2}+3\ Ca(OH)_{2}+O_{2}\rightarrow CaO\cdot 2\ MnO_{2}+3\ H_{2}O+2\ CaCl_{2}} }</annotation>
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</math></span><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/64dae807d7ff8616d9722bc1c7429260b19502c5.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.838ex; width:66.05ex; height:2.843ex;" alt="{\displaystyle \mathrm {2\ MnCl_{2}+3\ Ca(OH)_{2}+O_{2}\rightarrow CaO\cdot 2\ MnO_{2}+3\ H_{2}O+2\ CaCl_{2}} }" loading="lazy"></span></dd></dl>
<p>Das entstehende Calciummanganit reagiert mit HCl wie folgt:
</p>
<dl><dd><span class="mwe-math-element mwe-math-element-inline"><span class="mwe-math-mathml-inline mwe-math-mathml-a11y" style="display: none;"><math xmlns="http://www.w3.org/1998/Math/MathML" alttext="{\displaystyle \mathrm {CaO\cdot 2\ MnO_{2}+10\ HCl\rightarrow CaCl_{2}+2\ MnCl_{2}+2\ Cl_{2}+5\ H_{2}O} }">
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<annotation encoding="application/x-tex">{\displaystyle \mathrm {CaO\cdot 2\ MnO_{2}+10\ HCl\rightarrow CaCl_{2}+2\ MnCl_{2}+2\ Cl_{2}+5\ H_{2}O} }</annotation>
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</math></span><img src="./_assets_/eb734a37dd21ce173a46342d1cc64c92/b0598cb2726fbd8317cb10463d540371388857e1.svg" class="mwe-math-fallback-image-inline mw-invert skin-invert" aria-hidden="true" style="vertical-align: -0.671ex; width:62.542ex; height:2.509ex;" alt="{\displaystyle \mathrm {CaO\cdot 2\ MnO_{2}+10\ HCl\rightarrow CaCl_{2}+2\ MnCl_{2}+2\ Cl_{2}+5\ H_{2}O} }" loading="lazy"></span></dd></dl>
<p>Das MnCl<sub>2</sub> kann recycelt werden, während das CaCl<sub>2</sub> als Beiprodukt anfällt und entsorgt werden muss.
</p>
<div class="mw-heading mw-heading2"><h2 id="Weblinks">Weblinks</h2></div>
<ul><li><a rel="nofollow" class="external text" href="https://books.google.de/books?id=uutOnFlMCQkC&amp;pg=PA328&amp;dq=walter+weldon&amp;as_brr=3&amp;client=firefox-a&amp;hl=de"><i>Chemie: Grundwissen für Ingenieure</i></a>, von Gerd Blumenthal, Dietmar Linke, Siegfried Vieth (als Google-Book)</li></ul>
<div class="mw-heading mw-heading2"><h2 id="Einzelnachweise">Einzelnachweise</h2></div>
<ol class="references">
<li id="cite_note-1"><span class="mw-cite-backlink"><a href="#cite_ref-1">↑</a></span> <span class="reference-text"><span class="cite"><a rel="nofollow" class="external text" href="https://www.rse.org.uk/wp-content/uploads/2016/11/all_fellows.pdf"><i>Fellows Directory. Biographical Index: Former RSE Fellows 1783–2002.</i></a> (PDF-Datei) Royal Society of Edinburgh,<span class="Abrufdatum"> abgerufen am 21.&nbsp;April 2020</span>.</span><span style="display: none;" class="Z3988" title="ctx_ver=Z39.88-2004&amp;rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&amp;rfr_id=info%3Asid%2Fde.wikipedia.org%3AWalter+Weldon&amp;rft.title=Fellows+Directory.+Biographical+Index%3A+Former+RSE+Fellows+1783%E2%80%932002&amp;rft.description=Fellows+Directory.+Biographical+Index%3A+Former+RSE+Fellows+1783%E2%80%932002&amp;rft.identifier=https%3A%2F%2Fwww.rse.org.uk%2Fwp-content%2Fuploads%2F2016%2F11%2Fall_fellows.pdf&amp;rft.publisher=Royal+Society+of+Edinburgh">&nbsp;</span></span>
</li>
</ol>
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Normdaten&nbsp;(Person): <a href="Library_of_Congress_Control_Number" title="Library of Congress Control Number">LCCN</a>: <span class="-print"><a rel="nofollow" class="external text" href="https://id.loc.gov/authorities/no2009029325">no2009029325</a></span> | <a href="Virtual_International_Authority_File" title="Virtual International Authority File">VIAF</a>: <span class="-print"><a rel="nofollow" class="external text" href="https://viaf.org/viaf/66580695/">66580695</a></span> | </div>
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