I am using \autocite{some citation key} for my numerical referenced footnotes and
\renewcommand{\thefootnote}{\roman{footnote}}\footnote{some added text information}\renewcommand{\thefootnote}{\arabic{footnote}} for the roman numeral footnotes.
Is there a way to separate them in the footnote section, so that the numerial footnote style is listed before the roman numeral footnote style?
You can use the manyfoot package to define new 'levels' of footnotes. Then you just need to tell biblatex to use the new footnote level and redefine the usual footnote level to permanently use Roman numerals.
\documentclass[british]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{babel}
\usepackage{csquotes}
\usepackage[style=verbose-inote, backend=biber]{biblatex}
\usepackage{manyfoot}
\DeclareNewFootnote{BLX}
\makeatletter
\renewrobustcmd{\blx@mkbibfootnote}[2]{%
\iftoggle{blx@footnote}
{\blx@warning{Nested notes}%
\addspace\mkbibparens{#2}}
{\unspace
\ifnum\blx@notetype=\tw@
\expandafter\@firstoftwo
\else
\expandafter\@secondoftwo
\fi
{\csuse{blx@theendnote#1}{\protecting{\blxmkbibnote{end}{#2}}}}
{\csuse{footnote#1BLX}{\protecting{\blxmkbibnote{foot}{#2}}}}}}
\makeatother
\renewcommand*{\thefootnote}{\roman{footnote}}
\addbibresource{biblatex-examples.bib}
\begin{document}
Lorem\autocite{sigfridsson}
ipsum\footnote{dolor}
sit\autocite{worman}
amet\autocite{sigfridsson}
consectur\footnote{sit}.
\printbibliography
\end{document}
In a current version of LaTeX you can restart the citation footnotes in each chapter by adding
\counterwithin*{footnoteBLX}{chapter}
to the preamble. If you are using an older LaTeX version where that command is not yet in the kernel, it is probably easiest to use \makeatletter\@addtoreset{footnoteBLX}{chapter}\makeatother.
The space between the footnote types can be adjusted with
\setlength{\skip\footinsBLX}{5pt}
Och, I missed the bit about the citations coming before the Roman footnotes. I couldn't find a way around that that did not require defining a new footnote type for normal footnotes. But at least we can keep on using the original LaTeX footnotes for the citations, which makes the code shorter. For example like this
\documentclass[british]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{babel}
\usepackage{csquotes}
\usepackage[style=verbose-inote, backend=biber]{biblatex}
\usepackage{manyfoot}
\DeclareNewFootnote{ROMAN}
\renewcommand*{\thefootnoteROMAN}{\roman{footnoteROMAN}}
\addbibresource{biblatex-examples.bib}
\begin{document}
Lorem\autocite{sigfridsson}
ipsum\footnoteROMAN{dolor}
sit\autocite{worman}
amet\autocite{sigfridsson}
consectur\footnoteROMAN{sit}.
\printbibliography
\end{document}
